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. 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?

  • physics -

    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.

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