In the figure, 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 the ground at some stage, the minimum mass of A must be –
A
2M
B
M
C
D
A function of M and the force constant of the spring
Text Solution
Verified by ExpertsThe correct answer is:
C
The spring will exert the maximum force when the ball is at its lowest position. If the ball has descended through a distance x to reach this position, mgx = 
kx 2 . For the block B to leave contact, spring force = kx = Mg.
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