A cyclist rolls downhill from rest at point X with no pedalling. The cyclist then uses his brakes, and the cycle comes to a halt at point Y. Which energy transfers occur 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