calculate the force of gravitation between a man weight of 60Kg and a boy weight of 20Kg and standing 2m per apart
F = G x [M*m]/d^2
F =[6.67 x 10^-11] x [60 * 20] / 2^2
F =0.000000002001 = 2.001 x 10^-9 newtons.
