Question

A cyclist travels down a hill from rest at point X, without pedaling the cyclist applies his brakes and the cycle stops at point y which energy changes have taken place between X and Y .

Answer 1

Answer:

• gravitational potential → kinetic → thermal (heat)

Explanation:

• When cyclist is at point X , he has gravitational potential energy due to it's height.

• Between X to Y , this energy gets converted to kinetic energy and cyclist get speed.

• till point Y he applies break and convert that  kinetic energy to heat or thermal energy.

• Hence the correct order is 

• gravitational potential → kinetic → thermal (heat)

I hope it helps you :)