Q. A point mass is suspended by a massless spring of constant . The point mass is released from rest at , when elongation in the spring is 15 cm. The equation of displacement of particle as a function of time is (Take

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A

B

C

D

None of these

Solution:

The motion of block is SHM,

Here, equilibrium or mean position is at elongation,

The amplitude of the motion is
At displacement of body with respect to mean position is

or

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