posted by Anonymous .
. When a driver applies brakes to keep a car going downhill at constant speed and constant kinetic energy, the potential energy of the car decreases. Where does this energy go? Where does most of it appear in a hybrid vehicle?
The energy is converted to heat in from the friction of the brakes slowing the car down. It is released through the brake disks or brake drums.
While braking a hybrid vehical this energy is used to charge the reserve batteries for later use.