Which one of the following expressions gives the minimum speed required for a body to…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which one of the following expressions gives the minimum speed required for a body to leave the surface of a planet of mass

M

and radius

R

so that it never returns? (a)

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

(b)

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

(c)

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

(d)

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