A block is attached to a spring of stiffness \( k \). The other end of the spring is attached to...

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A block is attached to a spring of stiffness \( k \). The other end of the spring is attached to a fixed wall. The entire system
\( \mathrm{P} \) lie on a horizontal surface and the spring is in natural state. The

W natural length of the spring is \( l_{0} \). If the block is slowly lifted up vertically to a height \( \frac{5}{12} l_{0} \) from its initial position :
(A) The work done by the lifting force \( =\frac{k l_{0}^{2}}{288}+\frac{5}{12} m g l_{0} \)
(B) The work done by the spring force \( =\frac{k l_{0}^{2}}{288} \)
(C) The work done by the gravity \( =\frac{5}{12} m g l_{0} \)
(D) The work done by lifting force \( =-\frac{5}{12} m g l_{0}+\frac{k l_{0}^{2}}{288} \)
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