# 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 #9 j# to #45 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Jan 24, 2018

#### Answer:

The change in centripetal force is

#### Explanation:

The centripetal force is

The kinetic energy is

The variation of kinetic energy is

The mass is

The radius of the track is

The variation of centripetal force is