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A spring of unstretched length l has a ...

A spring of unstretched length l has a mass m with one end fixed to a rigid support. Assuming spring to be made of a uniform wire, the kinetic energy possessed by if its free end is pulled with uniform velocity v is

A

`(1)/(2) mv^(2)`

B

`(1)/(3) m v^(2)`

C

`m v^(2)`

D

`(1)/(6) m v^(2)`

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The correct Answer is:
D
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