Question

A body weighs 50 N on the surface of Earth. Its weight at a height equal to the radius of Earth from the surface is:

• A. 12.5 N
• B. 25 N
• C. 50 N
• D. 100 N

Hint:

Weight varies inversely as the square of distance from Earth’s centre.

Answer 1

The Correct Option is A

At height \(h=R\), distance from Earth’s centre \(=2R\). \[ W' = W\left(\frac{R}{2R}\right)^2 = \frac{W}{4} = \frac{50}{4}=12.5\ \text{N} \]