# A model train, with a mass of #3 kg#, is moving on a circular track with a radius of #1 m#. If the train's kinetic energy changes from #21 j# to #36 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Apr 29, 2016

To make it simple, lets find out the relation of kinetic energy and centripetal force with the things we know:

We know:

and

Hence,

Note,

Hence,