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Two plates each of the mass m are connec...

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

3mg

D

4mg

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The correct Answer is:
B
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