# A model train, with a mass of #16 kg#, is moving on a circular track with a radius of #9 m#. If the train's kinetic energy changes from #40 j# to #9 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Jul 12, 2017

#### Answer:

6.88 N.

#### Explanation:

Here,

In 1st case,

In 2nd case,

Thank you!!!