Question

. A man weights 60kg on the surface of the earth. The altitude where his weight will

be 30kg is (R is the radius of the earth)​

Answer 1

Answer:

Let acceleration due to gravity at a height h above the surface of earth be g

′

So, mg

′

=m

(R+h)

2

gR

2

or, 30=60×

(6400+h)

2

(6400)

2

So, h=6400

2

−6400=2624km

Answer 2

Explanation:

g'=g(1-2h/r)

g/2=g(l-2h/r)

1/2=1-2h/r

2h/r=1/2

h=r/4