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A small block of mass m is fixed at upper end of a massive vertical spring of spring constant `k=(2mg)/(L)` and natural length `10L` The lower end of spring is free and is at a height L from fixed horizontal floor as shown. The spring is initially unstressed and the spring block system is released from rest in the shown position.
Q. At the instant the speed of block is maximum the magitude of force exeted by the spring on the block is

A

`(mg)/(2)`

B

`mg`

C

Zero

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
When speed of block is maximum, net force on block is zero. Hence at that instant spring exerts a force of magnitude 'mg' on the block.
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