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A spring of constant 5xx10^(3) N/m is st...

A spring of constant `5xx10^(3)` N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is :

A

6·25 Nm

B

18·75 Nm

C

1250 Nm

D

25·00 Nm.

Text Solution

Verified by Experts

The correct Answer is:
B
Work done= change in P.E: of spring
`W=1/2K(x_(2)^(2)-x_(1)^(2))`
`=1/2 5xx10^(3)(10^(2)-5^(2))xx10^(-4)`
`=18.75Nm`?
Correct choice is (b).
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