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A spring of spring constant 5 xx 10^(3) ...

A spring of spring constant `5 xx 10^(3) N//m` is stretched initially by 5 cm from the unstretched position. The work required to further stretch the spring by another 5 cm is .

A

`12.50Nm`

B

`18.75Nm`

C

`25.00Nm`

D

`6.25Nm`

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