# A model train, with a mass of #6 kg#, is moving on a circular track with a radius of #4 m#. If the train's kinetic energy changes from #24 j# to #48 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Mar 4, 2017

#### Explanation:

The kinetic energy of the train is given by

which we can rearrange to find the velocity (which we need) as

so, calculating the velocity in both cases (

Therefore,

The equation of centripetal force is

where

Therefore we can say that change in centripetal force is

which, putting in the values we know, is