Find Gravitational Force on an object

[trivk96]

Homework Statement

An object has a weight W when it is on the
surface of a planet of radius R.
What will be the gravitational force on the
object after it has been moved to a distance
of 4 R from the center of the planet

Homework Equations

No clue

The Attempt at a Solution

no clue

 

[whoareyou]

Use Newton's Law of Universal Gravitation.

 

[trivk96]

oh thanks i got the answer