# 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 #18 j# to #27 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Feb 13, 2016

#### Answer:

The change in centripetal force should be 18 N

#### Explanation:

we know KE =(1/2)XmassX(velocity)^2

intial KE being 18J then massX(initial vel)^2 =36 J

and initial centripetal force ={massX(initial vel)^2}/radius

= 36 N (radius = 1m)

similarly we

final centripetal force = 54 N

Hence change in force = 18 N