# A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #3 m#. If the train's kinetic energy changes from #8 j# to #48 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Mar 6, 2016

#### Explanation:

Given we have to find the centripetal force on a model train of mass

The centripetal force of a body is

Substituting

Here,

So, change in centripetal force applied by tracks change by

Um.....yeah, that's why you end up with