Question

The gravitational force of attraction between two bodies
at a certain distance is 70 N. If the distance of separation
between them is doubled, then find the percentage change
in force of attraction?
1) Decreases by 25%
2) Decreases by 75%
3) Increases by 25%
4) Increases by 75%​

Answer 1

Answer:

the correct answer will be 50%

Answer 2

Explanation:

lets assume the distance b/w them is x

70N = Gm1m2/x^2

if the distance becomes 2x

F=Gm1m2/4x^2=1/4×70=35÷2=17.5

hence percentage decrease = 70-17.5÷70×100= 75%