A block is in SHM on a frictionless surface as shown in the figure. The position \( x=0 \) show ...

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A block is in SHM on a frictionless surface as shown in the figure. The position \( x=0 \) show the unstretched position of the spring. If the spring is, then stretched and the block is released at \( x=A \). Then, the speed of block at \( x=0 \) is
(a) 0
(b) \( A^{2} \sqrt{\frac{k}{m}} \)
(c) \( A^{2} \sqrt{\frac{2 k}{m}} \)
(d) \( A \sqrt{\frac{k}{m}} \)
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