Physics

Problem

Which of the following expressions gives the acceleration due to gravity

g

at the surface of a planet of mass

M

and radius

R

? a)

g = 2 G\dfrac{M}{R^{2}}

g = \dfrac{G M}{(2R)^{2}}

g = G\dfrac{M}{R^{2}}

g = 4 G\dfrac{M}{R^{2}}