A block of mass M = 40 kg is released on...

A block of mass M = 40 kg is released on a smooth incline from point A. After travelling through a length of 30 cm it strikes an ideal spring of force constant `K = 1000 N//m` . It compresses the spring and then gets pushed back. How much time after its release, the block will be back to point A?

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B, C, D

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