A ball A of mass m falls under gravity from a height h and strikes another ball B of mass m which is supported at rest on a spring of stiffness k. Assume perfectly elastic impact. Immediately after the impact:

The velocity of ball A is (1/2) \[\sqrt{2}\,\,gh\]

A ball A of mass m falls under gravity from a height h and strikes ano

1.	A ball A of mass m falls under gravity from a height h and strikes another ball B of mass m which is supported at rest on a spring of stiffness k. Assume perfectly elastic impact. Immediately after the impact:
A.	The velocity of ball A is (1/2) \[\sqrt{2}\,\,gh\]
B.	The velocity of ball A is zero
C.	300
D.	None of the above.
Answer» C. 300

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A ball A of mass m falls under gravity from a height h and strikes another ball B of mass m which is supported at rest on a spring of stiffness k. Assume perfectly elastic impact. Immediately after the impact:

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