How is energy conserved when a car slows down?

Answer 1

Objects use more energy when increasing in speed or starting while objects use less energy while going at a steady pace.

Answer 2

When a car slows down, its kinetic energy decreases as it loses speed. This kinetic energy is converted into other forms of energy, such as heat generated by the brakes and friction between the tires and the road. Thus, energy is conserved through this conversion process.