A certain planet has three times the radius of Earth and nine times the mass. How does the acceleration of gravity at the surface of this planet (ag) compare to the acceleration at the surface of Earth (g)?

What is the acceleration due to gravity on a planet on which an object with a mass of 20.0kg has a weight of 270N?

The moon's distance from the center of the Earth was decreased by a multiple of three. How would this affect the gravitational force of the Earth on the moon?

A ball is thrown horizontally off a cliff of height of with an initial velocity of . How far from the cliff will the ball land?