A spring is compressed by \( 10 \mathrm{~cm} \), if a block of mass is dropped on it from a heig...

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A spring is compressed by \( 10 \mathrm{~cm} \), if a block of mass is dropped on it from a height of \( 40 \mathrm{~cm} \). If the force constant of the spring is \( 980 \mathrm{Nm}^{-1} \), then which of the following is the mass of the block?
(a) \( 1 \mathrm{~kg} \)
(b) \( 2 \mathrm{~kg} \)
(c) \( 3 \mathrm{~kg} \)
(d) \( 4 \mathrm{~kg} \)
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