Explanation:
The weight of the body on the surface of earth can be found by the relation
W₁ = [tex]\frac{GMm}{R^2}[/tex] I
Here G is gravitational constant and M is the mass of earth .
m is the mass of the body
and R is the radius of earth or the distance of body from the center of the earth .
Now she moves to height equal to R . Thus the distance from center of earth becomes 2 R .
Thus Weight now is W₂ = [tex]\frac{GMm}{(2R)^2}[/tex] II
Dividing II by I , we have
[tex]\frac{W_2}{W_1}[/tex] = [tex]\frac{1}{4}[/tex]
But W₁ = 400 N
Thus W₂ = [tex]\frac{400}{4}[/tex] = 100 N
