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Force required to hold a spring stretched in beyond its natural length is lb.
Hookes law: , where spring constant.
is force required to maintain a spring stretched units beyond its natural length.
Here lb and feet.
Therefore, spring constant lb/ft.
Determine the work done in stretching the spring from its original length to in feet.
Consider .
Work done formula:
Work done in moving the object from to is .
Work done is ft-lb.
Work done is ft-lb.
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