A satellite of mass 1000 kg revolves around the earth in a circular path. If the distance between the satellite and the centre of the earth is 40000 km, find the gravitational force exerted on the satellite by the earth.
[G = 6.67 × 10-11 N.m2/kg2, mass or the earth = 6 × 1024 kg, radius or the earthe 6.4 × 106 m]