The force of gravity that acts on an object on the surface of Mars is 20 N. What force of gravity will act on
the same object on the surface of the Earth? (use gravitational field strength g = 9.8 N/Kg on the surface
of the Earth).
where M (= 6.39 × 1023kg) is the mass of Mars, Rm (= 3.39 × 106m) is radius of Mars.