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A block has a L shaped stand fixed to it...

A block has a L shaped stand fixed to it. Mass of the block with the stand is M. At the free end of the stand there is a spring which carries a ball of mass m. With the spring in its natural length, the ball is released. It begins to oscillate and the stand is tall enough so that the ball does not hit the block.
(a) Find maximum value of mass (m) of the ball for which the block will not lose contact with the ground?
(b) If the stand is not tall enough and the ball makes elastic impact with the block, will your answer to part (a) change?

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Verified by Experts

The correct Answer is:
For both (a) and (b) the block will not lose contact with the ground for any value of m.
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