Which one of the following expressions gives the escape velocity from the surface of…

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

Problem

Which one of the following expressions gives the escape velocity

v_e

from the surface of a planet of mass

M

and radius

R

? (a)

v_e = \sqrt{\dfrac{GM}{R}}

(b)

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

(c)

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

(d)

v_e = \sqrt{\dfrac{4GM}{R}}