Question

A man weight 60 N on the surface of earth . how far he must go so his weight become 30 N?​

Answer 1

ANSWER:

Let acceleration due to gravity at a height habove the surface of earth be g′

Radius of earth = 6400.

So, 

mg′=m(R+h)2gR2

30=60×(6400+h)2(6400)2

h=64002−6400=2624km

2624km He must go 2624km so his weight become 30 N.

Answer 2

Explanation:

it is due to the acceleration that a main with 16 on the surface of earth and then he must go so his weight of 30 N