In the figure shown, the ball \( A \) is released from rest, when the spring is at its natural (... VIDEO
In the figure shown, the ball \( A \) is released from rest, when the spring is at its natural (unstretched) length. For the block \( B \) of mass \( M \) to leave contact with ground at some stage, the minimum mass of \( A \) must be
(1) \( 2 M \)
(2) \( M \)
(3) \( M / 2 \)
(4) \( M / 4 \)
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