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(A) This is a classic demonstration of Newton's Cradle. When two objects of equal mass undergo a perfectly elastic collision,they exchange their veloc

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One ball at the left end will rise.

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(A) This is a classic demonstration of Newton's Cradle. When two objects of equal mass undergo a perfectly elastic collision,they exchange their velocities. When the ball at the right end is released,it gains velocity $v$ just before hitting the adjacent ball. Since all balls are identical and the collision is elastic,the momentum and kinetic energy are conserved. The momentum is transferred through the intermediate stationary balls to the ball at the opposite end. Consequently,the ball at the left end will rise to the same height from which the right ball was released,while the other four balls remain stationary. Therefore,only one ball at the left end will rise.

Five identical elastic balls are suspended in a row with strings of equal length such that the distance between the sides of the balls is very small. If the ball at the right end is released from one side,then:

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