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A point mass m = 20 kg, is suspended by ...

A point mass m = 20 kg, is suspended by a massless spring of constant 2000 N/M. The point mass is released when elongation in the spring is 15 cm. The equation of displacement of particle as a function of time is ( Take `g = 10 m//s^2` )

A

`y=10 sin 10t`

B

`y=10 cos 10t`

C

`y=10sin (10t +pi/6)`

D

None of these

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The correct Answer is:
C
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