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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

A

84 J

B

68 J

C

23 J

D

8 J

Text Solution

Verified by Experts

The correct Answer is:
D
Here `k=(F)/(x)=(10)/(1xx10^(-3))=106(4)N//m`
`W=(1)/(2)kx^(2)=(1)/(2)xx10^(4)xx(40xx10^(-3))^(2)=8 J`
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ERRORLESS -WORK , ENERGY , POWER AND COLLISION-Ordinary Thinking (Objective Questions) (Work Done by Variable Force)
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