Question

A body weighs 72 N on the surface of the earth.
What is the gravitational force on it, at a height
equal to half the radius of the earth ?
(1) 48 N
(2) 32 N
(3)
30 N
(4)
24 N​

Answer 1

Answer:

32N

Explanation:

It is because

mg'=mg(r/r+h)2

x=72(r2÷(r+r÷2)2)

x=72×4r2÷9r2

x=72×4÷9

x=8×4=32N