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Two plates each of mass m are connected ...

Two plates each of mass m are connected by a massless spring shown

A weight W is put on the upper plate which compresses the spring further. When W is removed, the entire assembly jumps up. The minimum weight W needed for the assembly to jump up when the weight is removed is just more than

A

mg

B

2mg

C

3 mg

D

4 mg

Text Solution

Verified by Experts

The correct Answer is:
A

`-mgxx x_(0)+1/2 k(x_(0)^(2)-0^(2))=0`
`(2 mg)/k=x_(0)=(mg)/k+(Mg)/k`
`M=m`
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