1) Jim rides his skateboard down a ramp that is in the shape of a quarter-circle
ID: 1289047 • Letter: 1
Question
1) Jim rides his skateboard down a ramp that is in the shape of a quarter-circle with a radius of 6.00m. At the bottom of the ramp, Jim is moving at 8.00 m/s. Jim and his skateboard have a mass of 60 k.g. How much work is done by friction as the skateboard goes down the ramp?
2) A soccer ball with mass 0.420kg is initially moving with speed 3.00m/s. A soccer player kicks the ball, exerting a constant force of magnitude 50N in the same direction as the ball's motion. The distance the player's foot must be in contact with the ball to increase the ball's speed to 6m/s is?
Explanation / Answer
m(1/2vf^2-gh)=-1608N
1/2(m(vf^2-vi^2)/50=.1134m
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