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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 in stretching the unstretched rubber-band by L is :

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

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