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Unformatted text preview: derive an expression for the speed V with which the marble hits the ground. (Assume acceleration due to gravity is g ) 3. 2006 113S2 Term Test Question 5 A rubber squash ball rebounds off a wall. At some instant the ball is motionless. Explain what has happened to the ball's kinetic energy. 4. A dog who jumps into the interior of a stationary ice boat is moving at v 1 = 32 km/h when he enters the boat, and his landing onto the boat can be regarded as a collision. The dogs mass is 14 kg and that of the boat plus boater is 160 kg. You can assume all of the motion is horizontal. a. Assuming that the ice surface is frictionless, what is the velocity of the boat after the collision? b. What is the ratio of the kinetic energy loss to the initial kinetic energy? c. Kinetic energy is lost. Where did it go?...
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 Spring '08
 HEARNSHAW
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