問題詳情

50. When a certain rubber band is stretched a distance x, it exerts a restoring force F = ax + bx2, where a and b are constants. Thework done in stretching this rubber band from x = 0 to x = L is:
(A) aL2+ bLx3
(B) aL + 2bL2
(C) a + 2bL
(D) bL
(E) aL2/2 + bL3/3 

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