Two plates each of the mass \( m \) are connected by a massless spring as shown. A weight \( W \...

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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 \( m \) than
[KVPY 2011]
(a) \( m g \)
(b) \( 2 m g \)
(c) \( 3 m g \)
(d) \( 4 m g \)
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