Physics

Problem

A body is moving in a low circular orbit about a planet of mass

M

and radius

R

. The radius of the orbit can be taken to be

R

itself. Then the ratio of the speed of this body in the orbit to the escape velocity from the planet is (a) 1 (b) 2 (c)

\frac{1}{\sqrt{2}}

(d)

\sqrt{2}