An object of mass is launched from the surface of the Earth

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

An object of mass

m

is launched from the surface of the Earth. The Earth has a mass

M

and radius

r

. The acceleration due to gravity at the surface of the Earth is

g

. What is the escape speed of the object from the surface of the Earth? (A)

\sqrt{gr}

(B)

\sqrt{2gr}

(C)

\sqrt{2Mgr}

(D)

\sqrt{2mgr}