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Question

A straight rod of length L extends from x=a to x=L+a. The gravitational force it exerts on point mass m at x=0, if the mass per unit length of the rod is A+Bx2, is given by :

A
Gm[A(1a1a+L)+BL]
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B
Gm[A(1a+L1a)+BL]
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C
Gm[A(1a+L1a)BL]
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D
Gm[A(1a1a+L)BL]
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