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A spring of spring constant 5 xx 10^(2) ...

A spring of spring constant `5 xx 10^(2) `Nm is streched initially by `5 cm` from the unstriched position . Then the work required to streach is further by another `5 cm` is

A

12.50 Nm

B

18.75 Nm

C

25.00 Nm

D

6.25 Nm

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