A block of mass m, attached to a spring of spring constant k, oscillates on a smooth horizontal table. The other end of the spring is fixed to a wall. The block has a speed v when the spring is at its natural length. Before coming to an instantaneous rest, if the block moves a distance x from the mean position, then

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x=mk

x=1vmk

k=vmk

x=mvk

answer is C.

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Detailed Solution

12mv2=12kx2∴ x=vmk

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