A block of mass \( m \) is attached to one end of a mass less spring of spring constant \( k \)....

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A block of mass \( m \) is attached to one end of a mass less spring of spring constant \( k \). The other end of spring is fixed to a wall. The block can move on a horizontal rough surface. The coefficient of friction between the block and the surface is \( \mu \). Then, the compression of the spring for which maximum extension of the spring becomes half of maximum compression is
(a) \( \frac{2 m g \mu}{k} \)
(b) \( \frac{m g \mu}{k} \)
(c) \( \frac{4 m g \mu}{k} \)
(d) None of these
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