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Question

When a rubber -band is stretched by a distance x,it exerts a restoring force of magnitude F=ax+bx2 where a and b are constants. the work done is stretching the unstretched rubber band by L is :

A
aL22+bL33
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B
12(aL22+bL33)
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C
aL2+bL3
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D
12(aL2+bL3)
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