momentun

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A small steel ball B is at rest on the edge of a table of height h=1m. Another steel ball A, used as the bob of a simple pendulum also of length h=1m, is released from rest with the pendulum suspension horizontal, and swings against B as shown in the diagram.The masses of the balls are identical and the collision is elastic.

(a)Which ball is in motion for the longest time?
(b)Which ball covers the greatest distance?

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