# If a 40 kg rock fell from a cliff and had a speed of 31.3 m/s when it hit the ground, what is its kinetic energy?

##### 1 Answer

Dec 19, 2016

#### Explanation:

To find the rock's kinetic energy we can use the following equation:

Based on the information you've given me, we know the mass of the rock as well as its velocity:

All we have to do is plug in the known values and solve for