A spring 40 mm long is stretched by the ...

A spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1mm, then the work done in stretching the spring through 40 mm is

84 J

68 J

23 J

8 J

Text Solution

Verified by Experts

The correct Answer is:

(d) k=10 `Nmm^(-1)`
`W_(1to2)=(1)/(2)kx^(2)-0=(1)/(2)xx10xx10^(3)(40xx10^(-3))^(2)=8 J`

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