ࡱ> mq ebjbjt+t+ %AAI^Q]PPPPd+d+d+x+x+x+x+8+,x+T .v1"111???$ x?d+?H???? PP11+ .   ? Pb1(d+1x+x+PPPP? >  d+1-D`\x+x+Chapter 6. Uniform Acceleration Problems: Speed and Velocity 6-1. A car travels a distance of 86 km at an average speed of 8 m/s. How many hours were required for the trip?  EMBED Equation   EMBED Equation.DSMT4  t = 2.99 h 6-2. Sound travels at an average speed of 340 m/s. Lightning from a distant thundercloud is seen almost immediately. If the sound of thunder reaches the ear 3 s later, how far away is the storm?  EMBED Equation  t = 58.8 ms 6-3. A small rocket leaves its pad and travels a distance of 40 m vertically upward before returning to the earth five seconds after it was launched. What was the average velocity for the trip?  EMBED Equation  v = 16.0 m/s 6-4. A car travels along a U-shaped curve for a distance of 400 m in 30 s. Its final location, however is only 40 m from the starting position. What is the average speed and what is the magnitude of the average velocity?  Average speed:  EMBED Equation  v = 13.3 m/s  Average velocity:  EMBED Equation  v = 1.33 m/s, E 6-5. A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is her average speed for the trip? t1 = 4 min = 0.0667 h; t2 = 10 min = 0.167 h s1 = v1t1 = (6 km/h)(0.0667 h) = 0.400 km s1 = v2t2 = (4 km/h)(0.167 h) = 0.667 km   EMBED Equation  v = 4.57 km/h 6-6. What is the average velocity for the entire trip described in Problem 6-5?  EMBED Equation  D = 0.778 km, 31.00  EMBED Equation  v = 3.33 km/h, 31.00 6-7. A car travels at an average speed of 60 mi/h for 3 h and 20 min. What was the distance?  t = 3 h + 0.333 h = 3.33 h; s = vt = (60 mi/h)(3.33 h); s = 200 mi  6.8 How long will it take to travel 400 km if the average speed is 90 km/h?  EMBED Equation  t = 4.44 h *6-9. A marble rolls up an inclined ramp a distance of 5 m, then stops and returns to a point 5 m below its starting point. The entire trip took only 2 s. What was the average speed and what was the average velocity? (s1 = 5 m, s2 = -10 m)  speed =  EMBED Equation  v = 7.50 m/s velocity =  EMBED Equation  v = 2.5 m/s, down plane. Uniform Acceleration 6-10. The tip of a robot arm is moving to the right at 8 m/s. Four seconds later, it is moving to the left at 2 m/s. What is the change in velocity and what is the acceleration. (v = vf - vo = (2 m/s) (8 m/s) (v = 10 m/s  EMBED Equation  a = 2.50 m/s2 6-11. An arrow accelerates from zero to 40 m/s in the 0.5 s it is in contact with the bow string. What is the average acceleration?  EMBED Equation  a = 80.0 m/s2  6-12. A car traveling initially at 50 km/h accelerates at a rate of 4 m/s2 for 3 s. What is the final speed? vo = 50 km/h = 13.9 m/s; vf = vo + at vf = (13.9 m/s) + (4 m/s2)(3 s) = 25.9 m/s; vf = 25.9 m/s  6-13. A truck traveling at 60 mi/h brakes to a stop in 180 ft. What was the average acceleration and stopping time? vo = 60 mi/h = 88.0 ft/s 2as = vf2 vo2  EMBED Equation.DSMT4  a = 21.5 ft/s2  EMBED Equation.DSMT4  t = 4.09 s 6-14. An arresting device on a carrier deck stops an airplane in 1.5 s. The average acceleration was 49 m/s2. What was the stopping distance? What was the initial speed? vf = vo + at; 0 = vo + ( 49 m/s2)(1.5 s); vo = 73.5 m/s s = vf t - at2 ; s = (0)(1.5 s) (-49 m/s2)(1.5 s)2; s = 55.1 m 6-15. In a braking test, a car traveling at 60 km/h is stopped in a time of 3 s. What was the acceleration and stopping distance? ( vo = 60 km/h = 16.7 m/s) vf = vo + at; (0) = (16.7 m/s) + a (3 s); a = 5.56 m/s2  EMBED Equation.DSMT4 ; s = 25.0 m 6-16. A bullet leaves a 28-in. rifle barrel at 2700 ft/s. What was its acceleration and time in the barrel? (s = 28 in. = 2.33 ft) 2as = vo2 - vf2 ;  EMBED Equation ; a = 1.56 x 106 m/s2  EMBED Equation ; t = 1.73 ms 6-17. The ball in Fig. 6-13 is given an initial velocity of 16 m/s at the bottom of an inclined plane. Two seconds later it is still moving up the plane, but with a velocity of only 4 m/s. What is the acceleration? vf = vo + at;  EMBED Equation ; a = -6.00 m/s2 6-18. For Problem 6-17, what is the maximum displacement from the bottom and what is the velocity 4 s after leaving the bottom? (Maximum displacement occurs when vf = 0) 2as = vo2 - vf2;  EMBED Equation ; s = +21.3 m vf = vo + at = 16 m/s = (-6 m/s2)(4 s); vf = - 8.00 m/s, down plane 6-19. A monorail train traveling at 80 km/h must be stopped in a distance of 40 m. What average acceleration is required and what is the stopping time? ( vo = 80 km/h = 22.2 m/s) 2as = vo2 - vf2;  EMBED Equation ; a = -6.17 m/s2  EMBED Equation  ; t = 3.60 m/s Gravity and Free-Falling Bodies 6-20. A ball is dropped from rest and falls for 5 s. What are its position and velocity? s = vot + at2; s = (0)(5 s) + (-9.8 m/s2)(5 s)2 ; s = -122.5 m vf = vo + at = 0 + (-9.8 m/s2)(5 s); v = -49.0 m/s  6-21. A rock is dropped from rest. When will its displacement be 18 m below the point of release? What is its velocity at that time? s = vot + at2; (-18 m) = (0)(t) + (-9.8 m/s2)t2 ; t = 1.92 s vf = vo + at = 0 + (-9.8 m/s2)(1.92 s); vf = -18.8 m/s  6-22. A woman drops a weight from the top of a bridge while a friend below measures the time to strike the water below. What is the height of the bridge if the time is 3 s? s = vot + at2 = (0) + (-9.8 m/s2)(3 s)2; s = -44.1 m  6-23. A brick is given an initial downward velocity of 6 m/s. What is its final velocity after falling a distance of 40 m? 2as = vo2 - vf2 ;  EMBED Equation ; v = (28.6 m/s; Since velocity is downward, v = - 28.6 m/s 6-24. A projectile is thrown vertically upward and returns to its starting position in 5 s. What was its initial velocity and how high did it rise? s = vot + at2; 0 = vo(5 s) + (-9.8 m/s2)(5 s)2 ; vo = 24.5 m/s It rises until vf = 0; 2as = vo2 - vf2 ;  EMBED Equation ; s = 30.6 m 6-25. An arrow is shot vertically upward with an initial velocity of 80 ft/s. What is its maximum height? (At maximum height, vf = 0; a = g = -32 ft/s2) 2as = vo2 - vf2;  EMBED Equation ; s = 100 ft 6-26. In Problem 6-25, what are the position and velocity of the arrow after 2 s and after 6 s? s = vot + at2 = (80 ft/s)(2 s) + (-32 ft/s2)(2 s)2 ; s = 96 ft vf = vo + at = (80 ft/s) + (-32 ft/s2)(2 s); vf = 16 ft/s s = vot + at2 = (80 ft/s)(6 s) + (-32 ft/s2)(6 s)2 ; s = -96 ft vf = vo + at = (80 ft/s) + (-32 ft/s2)(6 s); vf = -112 ft/s  6-27. A hammer is thrown vertically upward to the top of a roof 16 m high. What minimum initial velocity was required? 2as = vo2 - vf2 ;  EMBED Equation ; vo = 17.7 m/s Horizontal Projection 6-28. A baseball leaves a bat with a horizontal velocity of 20 m/s. In a time of 0.25 s, how far will it have traveled horizontally and how far has it fallen vertically? x = vox t = (20 m/s)(2.5 s) ; x = 50.0 m y = voy + gt2 = (0)(2.5 s) + (-9.8 m/s2)(0.25 s)2 y = -0.306 m 6-29. An airplane traveling at 70 m/s drops a box of supplies. What horizontal distance will the box travel before striking the ground 340 m below? First we find the time to fall: y = voy t + gt2  EMBED Equation  t = 8.33 s ; x = vox t = (70 m/s)(8.33 s) ; x = 583 m  6-30. At a lumber mill, logs are discharged horizontally at 15 m/s from a greased chute that is 20 m above a mill pond. How far do the logs travel horizontally? y = gt2;  EMBED Equation ; t = 2.02 s x = vox t = (15 m/s)(8.33 s) ; x = 30.3 m  6-31. A steel ball rolls off the edge of a table top 4 ft above the floor. If it strikes the floor 5 ft from the base of the table, what was its initial horizontal speed? First find time to drop 4 ft:  EMBED Equation ; t = 0.500 s x = vox t ;  EMBED Equation  ; vox = 10.0 ft/s 6-32. A bullet leaves the barrel of a weapon with an initial horizontal velocity of 400 m/s. Find the horizontal and vertical displacements after 3 s. x = vox t = (400 m/s)(3 s) ; x = 1200 m y = voy + gt2 = (0)(3 s) + (-9.8 m/s2)(3 s)2 y = -44.1 m  6-33. A projectile has an initial horizontal velocity of 40 m/s at the edge of a roof top. Find the horizontal and vertical components of its velocity after 3 s. vx = vox = 40 m/s vy = voy t + gt = 0 + (-9.8 m/s2)(3s); vy = -29.4 m/s The More General Problem of Trajectories 6-34. A stone is given an initial velocity of 20 m/s at an angle of 580. What are its horizontal and vertical displacements after 3 s? vox = (20 m/s) cos 580 = 10.6 m/s; voy = (20 m/s) sin 580 = 17.0 m/s x = voxt = (10.6 m/s)(3 s); x = 31.8 m y = voyt + gt2 = (17.0 m/s)(3 s) +(-9.8 m/s2)(3 s)2; y = 6.78 m  6-35. A baseball leaves the bat with a velocity of 30 m/s at an angle of 300. What are the horizontal and vertical components of its velocity after 3 s? vox = (30 m/s) cos 300 = 26.0 m/s; voy = (30 m/s) sin 300 = 15.0 m/s vx = vox = 26.0 m/s ; vx = 26.0 m/s vy = voy + gt = (15 m/s) + (-9.8 m/s2)(3 s) ; vy = -14.4 m/s  6-36. For the baseball in Problem 6-33, what is the maximum height and what is the range? ymax occurs when vy = 0, or when: vy = voy + gt = 0 and t = - voy/g   EMBED Equation ; Now we find ymax using this time. ymax = voyt + gt2 = (15 m/s)(1.53 s) + (-9.8 m/s2)(1.53 s)2; ymax = 11.5 m  The range will be reached when the time is t = 2(1.53 s) or t = 3.06 s, thus R = voxt= (30 m/s) cos 300 (3.06 s); R = 79.5 m  6-37. An arrow leaves the bow with an initial velocity of 120 ft/s at an angle of 370 with the horizontal. What are the horizontal and vertical components of is displacement two seconds later? vox = (120 ft/s) cos 370 = 104 ft/s; voy = (120 ft/s) sin 300 = 60.0 ft/s 6-37. (Cont.) The components of the initial velocity are: vox = 104 ft/s; voy = 60.0 ft/s x = voxt = (104 ft/s)(2 s); x = 208 ft y = voyt + gt2 = (60.0 m/s)(2 s) +(-32 ft/s2)(2 s)2; y = 56.0 ft  *6-38. In Problem 6-37, what are the magnitude and direction of arrows velocity after 2 s? vx = vox = 104 ft/s ; vx = 104 ft/s vy = voy + gt = (60 m/s) + (-32 ft/s2)(2 s) ; vy = -4.00 ft/s  *6-39. A golf ball in Fig. 6-14 leaves the tee with a velocity of 40 m/s at 650. If it lands on a green located 10 m higher than the tee, what was the time of flight, and what was the horizontal distance to the tee? vox = (40 m/s) cos 650 = 16.9 m/s; voy = (40 m/s) sin 650 = 36.25 m/s y = voyt + gt2: 10 ft = (36.25 m/s) t + (-9.8 m/s2)t2 Solving quadratic (4.9t2 36.25t + 10 = 0) yields: t1 = 0.287 s and t2 = 7.11 s The first time is for y = +10 m on the way up, the second is y = +10 m on the way down. Thus, the time from tee to green was: t = 7.11 s Horizontal distance to tee: x = voxt = (16.9 m/s)(7.11 s); x = 120 m  *6-40. A projectile leaves the ground with a velocity of 35 m/s at an angle of 320. What is the maximum height attained. vox = (35 m/s) cos 320 = 29.7 m/s; voy = (35 m/s) sin 320 = 18.55 m/s ymax occurs when vy = 0, or when: vy = voy + gt = 0 and t = - voy/g   EMBED Equation ; Now we find ymax using this time. ymax = voyt + gt2 = (18.55 m/s)(1.89 s) + (-9.8 m/s2)(1.89 s)2; ymax = 17.5 m *6-41. The projectile in Problem 6-40 rises and falls, striking a billboard at a point 8 m above the ground. What was the time of flight and how far did it travel horizontally. vox = (35 m/s) cos 320 = 29.7 m/s; voy = (35 m/s) sin 320 = 18.55 m/s y = voyt + gt2: 8 m = (18.55 m/s) t + (-9.8 m/s2)t2 Solving quadratic (4.9t2 18.55t + 8 = 0) yields: t1 = 0.497 s and t2 = 3.36 s The first time is for y = +8 m on the way up, the second is y = +8 m on the way down. Thus, the time from tee to green was: t = 3.29 s Horizontal distance to tee: x = voxt = (29.7 m/s)(3.29 s); x = 97.7 m Challenge Problems 6-42. A rocket travels in space at 60 m/s before it is given a sudden acceleration. Its velocity increases to 140 m/s in 8 s, what was its average acceleration and how far did it travel in this time?  EMBED Equation ; a = 10 m/s2  EMBED Equation ; t = 800 s  6-43. A railroad car starts from rest and coasts freely down an incline. With an average acceleration of 4 ft/s2, what will be the velocity after 5 s? What distance does it travel? vf = vo + at = 0 + (4 ft/s2)(5 s); vf = 20 ft/s s = vot + at2 = 0 + (4 ft/s2)(5 s)2; s = 50 ft *6-44. An object is projected horizontally at 20 m/s. At the same time, another object located 12 m down range is dropped from rest. When will they collide and how far are they located below the release point? A: vox = 20 m/s, voy = 0; B: vox = voy = 0 Ball B will have fallen the distance y at the same time t as ball A. Thus, x = voxt and (20 m/s)t = 12 m; t = 0.600 s y = at2 = (-9.8 m/s2)(0.6 s)2 ; y = -1.76 m  6-45. A truck moving at an initial velocity of 30 m/s is brought to a stop in 10 s. What was the acceleration of the car and what was the stopping distance?  EMBED Equation ; a = -3.00 m/s2  EMBED Equation ; s = 150 m 6-46. A ball is thrown vertically upward with an initial velocity of 23 m/s. What are its position and velocity after 2s, after 4 s, and after 8 s?  Apply s = vot + at2 and vf = vo + at for time of 2, 4, and 8 s:  (a) s = (23 m/s)(2 s) + (-9.8 m/s2)(2 s)2 ; s = 26.4 m  vf = (23 m/s) + (-9.8 m/s2)(2 s) ; vf = 3.40 m/s  (b) s = (23 m/s)(4 s) + (-9.8 m/s2)(4 s)2 ; s = 13.6 m  vf = (23 m/s) + (-9.8 m/s2)(4 s) ; vf = -16.2 m/s  (c) s = (23 m/s)(8 s) + (-9.8 m/s2)(8 s)2 ; s = -130 m vf = (23 m/s) + (-9.8 m/s2)(8 s) ; vf = -55.4 m/s 6-47. A stone is thrown vertically downward from the top of a bridge. Four seconds later it strikes the water below. If the final velocity was 60 m/s. What was the initial velocity of the stone and how high was the bridge? vf = vo + at; v0 = vf at = (-60 m/s) - (-9.8 m/s)(4 s); vo = -20.8 m/s s = vot + at2 = (-20.8 m/s)(4 s) + (-9.8 m/s)(4 s)2; s = 162 m  6-48. A ball is thrown vertically upward with an initial velocity of 80 ft/s. What are its position and velocity after (a) 1 s; (b) 3 s; and (c) 6 s Apply s = vot + at2 and vf = vo + at for time of 2, 4, and 8 s:  (a) s = (80 ft/s)(1 s) + (-32 ft/s2)(1 s)2 ; s = 64.0 ft  vf = (80 ft/s) + (-32 ft/s2)(2 s) ; vf = 16.0 ft/s (b) s = (80 ft/s)(3 s) + (-32 ft/s2)(3 s)2 ; s = 96.0 ft  vf = (80 ft/s) + (-32 ft/s2)(3 s) ; vf = -16.0 ft/s (c) s = (80 ft/s)(6 s) + (-32 ft/s2)(6 s)2 ; s = 64.0 ft vf = (80 ft/s) + (-32 ft/s2)(6 s) ; vf = -96.0 ft/s  6-49. An aircraft flying horizontally at 500 mi/h releases a package. Four seconds later, the package strikes the ground below. What was the altitude of the plane? y = gt2 = (-32 ft/s2)(4 s)2; y = -256 ft *6-50. In Problem 6-49, what was the horizontal range of the package and what are the components of its final velocity? vo = 500 mi/h = 733 ft/s; vx = vox = 733 ft/s; voy = 0; t = 4 s x = vxt = (733 ft/s)(4 s); x = 2930 ft vy = voy + at = 0 + (-32 ft/s)(4 s); vy = -128 ft/s; vx = 733 m/s *6-51. A putting green is located 240 ft horizontally and 64 ft vertically from the tee. What must be the magnitude and direction of the initial velocity if a ball is to strike the green at this location after a time of 4 s? x = voxt; 240 ft = vox (4 s); vox = 60 m/s s = vot + at2; 64 ft = voy(4 s) + (-32 ft/s2)(4 s)2; voy = 80 ft/s  EMBED Equation ;  EMBED Equation  v = 100 ft/s, ( = 53.10 Critical Thinking Questions 6-52. A long strip of pavement is marked off in 100-m intervals. Students use stopwatches to record the times a car passes each mark. The following data is listed: Distance, m010 m20 m30 m40 m50 mTime, s02.1 s4.3 s6.4 s8.4 s10.5 s Plot a graph with distance along the y-axis and time along the x-axis. What is the significance of the slope of this curve? What is the average speed of the car? At what instant in time is the distance equal to 34 m? What is the acceleration of the car? Data taken directly from the graph (not drawn): Ans. Slope is v, 4.76 m/s, 7.14 s, 0. 6-53. An astronaut tests gravity on the moon by dropping a tool from a height of 5 m. The following data are recorded electronically. Height, m5.00 m4.00 m3.00 m2.00 m1.00 m0 mTime, s01.11 s1.56 s1.92 s2.21 s2.47 s 6-53. (Cont.) Plot the graph of this data. Is it a straight line? What is the average speed for the entire fall? What is the acceleration? How would you compare this with gravity on earth? Data taken directly from the graph (not drawn): Ans. Slope is v, 4.76 m/s, 7.14 s, 0. *6-54. A car is traveling initially North at 20 m/s. After traveling a distance of 6 m, the car passes point A where it's velocity is still northward but is reduced to 5 m/s. (a) What are the magnitude and direction of the acceleration of the car? (b) What time was required? (c) If the acceleration is held constant, what will be the velocity of the car when it returns to point A?  (a) vo = 20 m/s, vf = 5 m/s, x = 6 m 2as = vo2 - vf2; EMBED Equation.DSMT4 ; a = -31.2 m/s2  (b)  EMBED Equation.DSMT4 ; t = 0.480 s (c) Starts at A with vo = + 5 m/s then returns to A with zero net displacement (s = 0):  2as = vo2 - vf2; 0 = (5 m/s)2 vf2;  EMBED Equation ; vf = - 5 m/s  *6-55. A ball moving up an incline is initially located 6 m from the bottom of an incline and has a velocity of 4 m/s. Five seconds later, it is located 3 m from the bottom. Assuming constant acceleration, what was the average velocity? What is the meaning of a negative average velocity? What is the average acceleration and final velocity? vo = + 4 m/s; s = -3 m; t = 5 s Find vavg s = vavg t;  EMBED Equation  vavg = -0.600 m/s Negative average velocity means that the velocity was down the plane most of the time.  *6-55. (Cont.) s = vot + at2; -3 m = (4 m/s)(5 s) + a (5 s)2; a = -1.84 m/s2 vf = vo + at = 4 m/s + (-1.84 m/s2)(5 s); vf = -5.20 m/s  *6-56. The acceleration due to gravity on an distant planet is determined to be one-fourth its value on the earth. Does this mean that a ball dropped from a height of 4 m above this planet will strike the ground in one-fourth the time? What are the times required on the planet and on earth? The distance as a function of time is given by: s = at2 so that one-fourth the acceleration should result in twice the drop time.  EMBED Equation  te = 0.904 s  EMBED Equation  tp = 1.81 s  *6-57. Consider the two balls A and B shown in Fig. 6-15. Ball A has a constant acceleration of 4 m/s2 directed to the right, and ball B has a constant acceleration of 2 m/s2 directed to the left. Ball A is initially traveling to the left at 2 m/s, while ball B is traveling to the left initially at 5 m/s. Find the time t at which the balls collide. Also, assuming x = 0 at the initial position of ball A, what is their common displacement when they collide? Equations of displacement for A and B: s = so + vot + at2 (watch signs) For A: sA = 0 + (-2 m/s)t + (+4 m/s2) t2 For B: sB = 18 m + (-5 m/s)t + (-2 m/s2) t2; Next simplify and set sA = sB - 2t + 2t2 = 18 5t - t2 ( 3t2 + 3t 18 = 0 ( t1 = - 3 s, t2 = +2 s  Accept t = +3 s as meaningful answer, then substitute to find either sA or sB: sA = -2(2 s) + 2(2 s)2; x = + 4 m *6-58. Initially, a truck with a velocity of 40 ft/s is located distance of 500 ft to the right of a car. If the car begins at rest and accelerates at 10 ft/s2, when will it overtake the truck? How far is the point from the initial position of the car? Equations of displacement for car and truck: s = so + vot + at2 (watch signs) For car: sC = 0 + (+10 ft/s2) t2 ; Truck: sT = 500 ft + (40 ft/s)t + 0; Set sC = sT 5t2 = 500 + 40t or t2 8t 100 = 0; t1 = -6.77 s; t2 = +14.8 s Solve for either distance: sC = (10 ft/s2)(14.8 s)2; s = 1092 ft *6-59. A ball is dropped from rest at the top of a 100-m tall building. At the same instant a second ball is thrown upward from the base of the building with an initial velocity of 50 m/s. When will the two balls collide and at what distance above the street? For A: sA = 100 m + v0At + gt2 = 100 m + 0 + (-9.8 m/s2) t2  For B: sB = 0 + (50 m/s)t + (-9.8 m/s2) t2 Set sA = sB  100 4.9 t2 = 50 t 4.9 t2; 50 t = 100; t = 2.00 s Solve for s: sA = 100 m (4.9 m/s2)(2 s)2; s = 80.4 m  *6-60. A balloonist rising vertically with a velocity of 4 m/s releases a sandbag at the instant when the balloon is 16 m above the ground. Compute the position and velocity of the sandbag relative to the ground after 0.3 s and 2 s. How many seconds after its release will it strike the ground? The initial velocity of the bag is that of the balloon: voB = + 4 m/s  From ground: s = soB + voBt + gt2; s = 18 m + (4 m/s)t + (-9.8 m/s2)t2 s = 18 m + (4 m/s)(0.3 s) (4.9 m/s2)(0.3 s)2 ; s = 16.8 m *6-61. An arrow is shot upward with a velocity of 40 m/s. Three seconds later, another arrow is shot upward with a velocity of 60 m/s. At what time and position will they meet? Let t1 = t be time for first arrow, then t2 = t - 3 for second arrow. s1 = (40 m/s)t1 + (-9.8 m/s2)t12 ; s1 = 40t 4.9t2 s2 = (60 m/s)t2 + (-9.8 m/s2)t22 ; s2 = 60(t 3) - 4.9(t 3)2  s1 = s2; 40t 4.9t2 = 60t 180 4.9(t2 6t + 9)  The solution for t gives: t = 4.54 s Now find position: s1 = s2 = (40 m/s)(4.54 s) (4.9 m/s2)(4.54 s)2; s = 80.6 m  *6-62. Someone wishes to strike a target, whose horizontal range is 12 km. What must be the velocity of an object projected at an angle of 350 if it is to strike the target. What is the time of flight? y = voyt + gt2 = 0; ( vo sin 350)t = (4.9 m/s2)t2 or  EMBED Equation  R = voxt = 12 km; (vo cos 350)t = 12,000 m;  EMBED Equation  Set t = t   EMBED Equation ; From which vo = 354 m/s and t = 41.4 s *6-63. A wild boar charges directly toward a hunter with a constant speed of 60 ft/s. At the instant the boar is 100 yd away, the hunter fires an arrow at 300 with the ground. What must be the velocity of the arrow if it is to strike its target? y = 0 = (v0 sin 300)t + (-32 ft/s2)t2; Solve for t  EMBED Equation ; t = 0.03125 vo s1 =( v0 cos 300) t = (0.866 vo)(0.03125 vo); s1 = 0.0271 vo2 *6-63. 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Tippens93lMicrosoft Word 8.0@kx@,L @hG@\ M ՜.+,D՜.+,8 hp  SPSU 'y_1 DocumentSummaryInformation8CompObjj Chapter 2 Title 6> _PID_GUIDAN{3ECA96CA-F670-11D2-B9D0-44455354616F}  FMicrosoft Word Document MSWordDocWord.Document.89q2GLM 5Ti5 J   Lgln1Rgh}Vk :OPe g$h$%%}&&''(((())))))]*^*(-*-@.U.....61?1L1M12)2=2R2j2k233P5Q55 6&6;6M6N688L:M:<<====>>@@@@@AUCWC>D@DcEeEG:G=GCGZGwG}GGH/HIHKHIIeJgJKKLLLLLMMMyPzPPPRRTTTTZUZUVVVVJYJYLYNYTZiZZZZZ[[[[![#[\\\\R\R\_\t\\\]]]F^H^I^I^Q^R^T^i^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^__________________ _ _ _ _ _ _ _ _ _ _____________________________________ _ _!_!_"_"_#_#_$_$_%_%_&_&_'_'_(_(_)_)_*_*_+_+_,_,_-_-_._._/_/_0_0_1_1_2_2_3_3_4_4_5_5_6_6_7_7_8_8_9_9_:_:_;_;_<_<_=_=_>_>_?_?_@_@_A_A_B_B_C_C_D_D_E_E_F_F_G_G_H_H_I_I_J_J_K_K_L_L_M_M_N_N_O_O_P_P_Q_Q_R_R_S_S_T_T_U_U_V_V_W_W_X_X_Y_Y_Z_Z_[_[_\_\_]_]_^_^_____`_`_a_a_b_b_c_c_d_d_e_e_f_f_g_g_h_h_i_i_j_j_k_k_l_l_m_m_n_n_o_o_p_p_q_q_r_r_s_s_t_t_u_u_v_v_w_w_x_x_y_y_z_z_{_{_|_|_}_}_~_~______________________________________``` ` ` `````#`$`/`0`6`7`D`E`Q`R`T`U`b`c`p`q`z`{``````````````````````````` a aaaaaaaaaaa a!a$a%a'a(a*a+a-a.a0a1a4a5a8a9aHaIaWaXaZa[aeafa~aaPaul E. 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