Question

a body weighs 25kg on the surface of the earth. if the mass of earth is 6*10^29 kg, radius is 6.4*10^6 m, G=6.67*10^-11Nm^2 / kg.calculate
(a) force of attraction between the body and earth.
(b) the acceleration produced in tje body.
(c) the acceleration produced in the earth.

Answer 1

(a)force = GMm/r^2
         =6.67*10^-11 * 6*10^29 * 25 /(6.4*10^6)^2
         =24.5* 10^6 N
i know just the first part ...sorry ...it might be helpful