Physics

Problem

A particle of mass

m

is moved radially outward from a distance

2R

4R

from Earth’s centre, where

R

is Earth’s radius. If

M

is Earth’s mass and

G

is the universal gravitational constant, the work done by Earth’s gravitational force during this transfer is a)

+\dfrac{GMm}{4R}

-\dfrac{GMm}{8R}

-\dfrac{GMm}{4R}

+\dfrac{GMm}{2R}