Question

The work done by the gravitational force of earth acting on a satellite moving around it in a circular path is

• A. 9.8 J
• B. 980 J
• C. Zero
• D. -9.8 J

Answer 1

The correct option is C Zero

In circular motion the force acting toward the centre,so the angle between displacement(S) and the force becomes ${90}^0$.
As, $W=FScos\theta$
Since, $cos{90}^0=0$
So, $W=0$
Hence, option C is correct.