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Question

A straight rod of length L extends form x=a to x=L+a. The gravitational force on a point mass m at x=0 if the mass per unit length of the rod is (A+Bx2), is


A

GmA(1a+L1a+BL]

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B

GmA[1a1a+L+BL]

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C

GmA[(1a+L1a)BL]

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D

GmA[(1a1a+L)BL]

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