# A model train, with a mass of #3 kg#, is moving on a circular track with a radius of #5 m#. If the train's kinetic energy changes from #32 j# to #12 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Feb 2, 2016

#### Explanation:

Start by writing the equation for Kinetic Energy, KE: