Kinetic energy is the energy that comes from motion. When a bicycle slows down its motion becomes less so its kinetic energy becomes less.
when you slow down, your kinetic energy is reduced.
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When you apply the brakes, the bicycle's mechanical energy is transformed into thermal energy as the brake pads rub against the bicycle's wheels. The total amount of energy never changes. The additional thermal energy warms the brakes, the wheels, and the air around the bicycle.
A moving bike has kinetic energy that gets turned into heat when braking to a stop.