A 100g steel ball falls from a height of 1.8m on to a metal plate and rebounds to a height of 1.25m. Find  a. the p.e. of the ball before the fall b. its k.e. as it hits the plate, c. its velocity on hitting the plate,  d. its k.e. as it leaves the plate on the rebound,  e. its velocity of rebound.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”