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A student standing on a knoll throws a snowball horizontally 4.5 meters above the level ground toward a smokestack 15 meters away. The snowball hits the smokestack 0.65 second after being released. [Neglect air resistance.] 15 m 14 45 m Level ground At the instant the snowball is released, the horizontal component of its velocity is approximately A) 6.9 m/ B) 9.8 m/s C) 17 m/'s D) 23 m/s Base your answers to questions 28 and 29 on 30. The graph below represents the relationship between the information and diagram below. speed and time for a car moving in a straight line. Speed vs. Time A child kicks a ball with an initial velocity of 8.5 30.- meters per second at an angle of 35 with the horizontal, as shown. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second. [Neglect air resistance.] 20.- Speed (m/'s) Viy = 4.9 m/s 10 vi = 8.5 m's 35 Horizontal 1.0 2.0 3.0 Time (s) 28. The horizontal component of the ball's initial The magnitude of the car's acceleration is velocity is approximately A) 1.0 m/s2 B) 0.10 m/s2 A) 3.6 m/s B) 7.0 m/s C) 10 m/s2 D) 0.0 m/s2 C) 4.9 mis D) 13 m/'s 29. The maximum height reached by the ball is approximately A) 1.2 m B) 2.5 m C) 4.9 m D) 8.5 m Base your answers to questions 31 through 34 on the 35. Note that the question below only has three following information. In the diagram below, a choices. 10.-kilogram sphere, A, is projected horizontally with a velocity of 30. meters per second due east from a height of 20. meters above level ground. At the same instant, a 20.-kilogram sphere, B, is projected The diagram below represents the path of a stunt car horizontally with a velocity of 10. meters per second that is driven off a cliff, neglecting friction. due west from a height of 80. meters above level Path of car ground. [Neglect air friction. ] v= 10. m/'s west A Y - 30. m/'s east in m in m Compared to the horizontal component of the car's 20. m velocity at point A, the horizontal component of the -100. m car's velocity at point B is A) smaller B) greater 31. Initially, the spheres are separated by a horizontal C) the same distance of 100. meters. What is the horizontal 36. Two spheres, A and B, are simultaneously projected separation of the spheres at the end of 1.5 seconds? horizontally from the top of a tower. Sphere A has a A) 15 m B) 30 m horizontal speed of 40. meters per second and sphere C) 40. m D) 45 m B has a horizontal speed of 20. meters per second. 32. Compared to the vertical acceleration of sphere A, Which statement best describes the time required for the vertical acceleration of sphere B is the spheres to reach the ground and the horizontal distance they travel? [Neglect friction and assume A) the same B) twice as great the ground is level.] C) one-half as great D) four times as great A) Both spheres hit the ground at the same time 33. The magnitude of the horizontal acceleration of and at the same distance from the base of the sphere A is tower A) 0.0 m/s2 B) 2.0 m/s2 B) Both spheres hit the ground at the same time, but sphere A lands twice as far as C) 9.8 m/s2 D) 15 m/s sphere B from the base of the tower. $4. Initially, the spheres are separated by a horizontal C) Both spheres hit the ground at the same time, distance of 100. meters. What is the horizontal but sphere B lands twice as far as sphere A separation of the spheres at the end of 1.5 seconds? from the base of the tower. A) 15 m B) 30 m D) Sphere A hits the ground before sphere B, and C) 40. m sphere A lands twice as far as sphere B from the D) 45 m base of the tower37. The diagram represents a bicycle and rider traveling | 40. Base your answer to the following question on the to the right at a constant speed. A ball is dropped information and diagram below from the hand of the cyclist. A golf ball leaves a golf club with an initial velocity of 40.0 meters per second at an angle of 40" with the horizontal. Which set of graphs best represents the horizontal motion of the ball relative to the ground? [Neglect air resistance.] Vi = 40.0 m/'s What is the vertical component of the golf ball's initial velocity? A) 25.7 m's B) 30.6 m/s C) 40.0 m/'s D) 61.3 m/'s 41. Four projectiles, A, B, C, and D, were launched from, and returned to, level ground. The data table below show the initial horizontal speed, initial 38. A ball is thrown horizontally from the top of a vertical speed, and time of flight for each projectile. building with an initial velocity of 15 meters per Data Table second. At the same instant, a second ball is dropped Projectile Initial Horizontal Initial Vertical Time of Flight (s) from the top of the building. The two balls have the 60.0 29.4 6.00 same 60.0 19.6 4.00 A) path as they fall 50.0 24.5 5.00 196 4.00 B)final velocity as they reach the ground C)initial horizontal velocity D) initial vertical velocity Which projectile traveled the greatest horizontal 39. A projectile is launched at an angle above the distance? [Neglect friction. ] ground. The horizontal component of the projectile's A) A B) B C) C D) D velocity. vx, is initially 40. meters per second. The vertical component of the projectile's velocity, vy, is initially 30. meters per second. What are the components of the projectile's velocity after 2.0 seconds of flight? [Neglect friction. A) vx = 40. m/'s and vy = 10. m/s Bjur = 40. m/'s and vy = 30. m/'s Chur = 20. m/'s and vy = 10. m/'s D) vx - 20. m/'s and vy = 30. m/'s Base your answers to questions 42 through 45 on the diagram and information below. A machine launches a tennis ball at an angle of 45" with the horizontal, as shown. The ball has an initial vertical velocity of 9.0 meters per second and an initial horizontal velocity of 9.0 meters per second. The ball reaches its maximum height 0.92 second after its launch. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] Elapsed Time = 0.92 s Vy = 9.0 m/'s Launcher Vix = 9.0 m/s 45 Horizontal 42. The speed at which the launcher fires tennis balls is constant, but the angle between the launcher and the horizontal can be varied. As the angle is decreased from 45 to 30.", the range of the tennis balls A) decreases B) increases ") remains the same 43. The speed of the tennis ball as it leaves the launcher is approximately A) 4.5 m/'s B) 8.3 m/s C) 13 m/'s D) 18 m/'s 44. The total horizontal distance traveled by the tennis ball during the entire time it is in the air is approximately A) 23 m B) 17m C) 8.3 m D) 4.1 m