Which expression gives the minimum speed an object of negligible mass must have at…

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

Problem

Which expression gives the minimum speed an object of negligible mass must have at the surface of a planet of mass

M

and radius

R

in order to escape the planet’s gravitational influence? (a)

\sqrt{\dfrac{GM}{2R}}

(b)

2\sqrt{\dfrac{GM}{R}}

(c)

\sqrt{\dfrac{2GM}{R}}

(d)

\sqrt{\dfrac{GM}{R}}