A)
Force, F = GMm/(R + L)^2
F = (6.67 x 10^-11 x 108 x 1.99 x 10^30 x 1380)/(10000 + 50)^2 = 1.96 x 10^17 N
B)
dg = Gm(1/R1^2 - 1/R2^2)
dg = (6.67 x 10^-11 x 108 x 1.99 x 10^30)(-1/(10000 + 100)^2 + 1/(10000)^2)
dg = 2.82 x 10^12 N/kg
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