What is the gravitational potential energy of a 7 kg object on a shelf 2/5 m high?

1 Answer
Dec 19, 2015

27.44 Joules

Explanation:

The formula for gravitational potential energy is E=mgh, where m is the mass of an object, g is the gravitational field strength it experiences and h is its height above a known level.

In this calculation I'm assuming the gravitational field strength g=9.8 ms^-2.

E=7*9.8*2/5=27.44 J

This is the amount of work that would have to be done to lift the object from ground level onto the shelf.