A straight rod of length l extends from x=α to x=l+α. If the mass per unit length is (a+b x^2). T...

A straight rod of length l extends from x=α to x=l+α.
If the mass per unit length is (a+b x^2). The gravitational force it
exerts on a point mass m placed at x=0 is given by :
Figure 6.100
(A) G m(a(1/α-1/α+l)+b l)
(B) G m(a+b x^2)/l^2
(C) Gm(α(1/a-1/a+l)+b l)
(D) G m(a(1/α+l-1/α)+b l)

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