# A model train, with a mass of #9 kg#, is moving on a circular track with a radius of #15 m#. If the train's kinetic energy changes from #96 j# to #48 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Jun 19, 2018

The change in centripetal force is

#### Explanation:

The mass of the train is

The radius of the track is

The centripetal force is

The kinetic energy is

Therefore,

The variation of kinetic energy is

So,

The change in centripetal force is