Question

A satellite is revolving around the earth in a circular orbit with kinetic energy $x$. The minimum kinetic energy that should be given to it so that it just escapes into the outer space, is:

• A. $\frac{x}{2}$
• B. $x$
• C. $\sqrt{2}x$
• D. $2x$

Answer 1

The correct option is A $\frac{x}{2}$

As the total binding energy $=\frac{-K.E}{2}$
Binding energy $=\frac{-x}{2}$
So, $\frac{x}{2}$ energy should be given so that it can escape.