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In the figure, block A is released from ...

In the figure, block A is released from rest when the spring is its natural length for the block B of mass m to leave contact with the ground at some stage what should be the minimum mass of block A?
.

A

`2M`

B

`M`

C

`M//2`

D

A function of `M` and the force constant of the spring.

Text Solution

Verified by Experts

The correct Answer is:
C
The spring will exert the maximum force when the ball is at its lowest postion. If the ball has descended through a distance `x` to reach this position, `mgx=(1)/(2)kx^(2)`. Where `k` is the force constant of the spring. For the block `B` to leave contact, spring force `=kx=Mg`
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