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4) A girl of mass 55 kg throws a ball of mass 0.8 kg against a...

4) A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. Find
(a) change in momentum of the ball
(b) the average force exerted on the wall by the ball?
(c) if the girl stands on a frictionless icy surface while throwing the ball, describe and quantify the girl’s motion.

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Answer #1

Use the initial and final velocity to find the change in momentum and divide the change in momentum by contact time to find the force exerted as shown below

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