A light spring of length \( 20 \mathrm{~cm} \) and force constant \...

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A light spring of length \( 20 \mathrm{~cm} \) and force constant \( 2 \mathrm{~N} / \mathrm{cm} \) is placed vertically on a table. A small block of mass \( 1 \mathrm{~kg} \) falls on it. The length \( \mathrm{h} \) from the surface of the table at which the block will have the maximum velocity is :
(A) \( 20 \mathrm{~cm} \)
(B) \( 15 \mathrm{~cm} \)
(C) \( 10 \mathrm{~cm} \)
(D) \( 5 \mathrm{~cm} \)
\( \mathrm{P} \)
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