# 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 #4 j# to #15 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

May 9, 2017

#### Explanation:

we know that the change in kinetic energy of the system

we also know that change in centripetal force is

centripetal force =

so we gonna substitute the values we get

we put this value in centripetal force change equation we get