Question

if a man weights 60kg on earth surface, how far must he go from the centre of earth so that his weight become 30kg ?(R=6400km)

Answer 1

half the way away from the place just divide it by 2

Answer 2

Answer weight of a body varies inversely as the square of the distance from the centre of the earth.

W2/W1=R1²/R2²

30/60=R1²/R2²

1/√2=R1/R2

R2=√2R1

R2=√2×6.4 ×10 to the power 6 metre

R2=9.05×10 to the power six.