A cyclist moves downhill from rest at point X without pedalling. The cyclist uses his brakes and the cycle comes to a stop at point Y. Which energy transfers have occurred between X and Y?
- Agravitational potential $\rightarrow$ kinetic $\rightarrow$ internal (thermal)
- Bgravitational potential $\rightarrow$ internal (thermal) $\rightarrow$ kinetic
- Ckinetic $\rightarrow$ gravitational potential $\rightarrow$ internal (thermal)
- Dkinetic $\rightarrow$ internal (thermal) $\rightarrow$ gravitational potential