A block of mass \( m \) is attached with a massless spring of force constant \( k \). The block ...

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A block of mass \( m \) is attached with a massless spring of force constant \( k \). The block is placed over a fixed rough inclined surface for which the coefficient of friction is \( \mu=3 / 4 \). The block of mass \( m \) is initially at rest. The block of mass \( M \) is released from rest with spring in upstretched state. The minimum value of \( M \) required to move the block up the plane is (neglect mass of string and pulley and friction in pulley.)
(1) \( \frac{3}{5} m \)
(2) \( \frac{4}{5} m \)
(3) \( \frac{6}{5} m \)
(4) \( \frac{3}{2} m \)
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