$A$ block of mass $m$ is released from rest at point $A$ on an inclined plane of angle $\theta$ with the vertical. The block slides down and compresses a spring of spring constant $k$. Find the compression in the spring when the speed of the block is maximum.
- A$\frac{mg\sin \theta}{k}$
- B$\frac{2mg\sin \theta}{k}$
- C$\frac{mg\cos \theta}{k}$
- D$\frac{mg}{k}$
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