Kinematics #3 : Projectiles (name) 1. A golf ball was struck from the first tee at Lunar Golf and Country Club. It was given a velocity of 48 m/s at an angle of 40.° to the horizontal. On the moon, g = 1.6 m /s 2. (a) What are the vertical and horizontal components of the ball's initial velocity? vx = vy = . . (b) For what interval of time is the ball in flight? t= . (c) How far will the ball travel horizontally? dy = . 2. A rock is thrown horizontally from the top of a cliff 98 m high, with a horizontal speed of 27 m/s. (a) For what interval of time is the rock in the air? t= . (b) How far from the base of the cliff does the rock land? dx = . (c) With what velocity does the rock hit? v= 17 . 3. An earth bound golfer strikes a golf ball giving it a velocity of 48 m/s at an angle of 50.° to the horizontal.(a) What are the vertical and horizontal components of the ball's initial velocity? vx = vy = . . t= . (b) How long is the ball in the air? (c) What is the horizontal distance covered by the ball while in flight? dx = . (d) What velocity does the ball have at the top of its trajectory? v= . 4. A rescue pilot wishes to drop a package of emergency supplies so that it lands as close as possible to a target. If the plane travels with a velocity of 81 m/s and is flying 125 m above the target, how far away (horizontally) from the target must the rescue pilot drop the package? dx = . Answers: 1. a) 37 m/s, 31 m/s b) 39 s c) 1.4 x 103 m 2. a) 4.5 s b) 120 m c)51 m/s [ 58o below horiz] 3. a) 37 m/s, 31 m/s b) 7.5 s c) 230 m d) 31 m/s 4. 410 m 18

Kinematics #3 Projectiles

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