when the brakes are applied to stop the car, it does not respond to zero velocity immediately since there is momentum. the moving vehicle kinetic mechanical energy is converted to heat energy by the brakes. it takes time for the brakes to convert this motion to heat, consequently, the hot brakes components do not immediately quench to ambient temperature. imagine stopping like the way you meant it, like hitting a brick wall from X mph to decelerate immediately to zero mph, you will sustain a lot of injury and sustain damage to your car. it is a matter of inertia and momentum we learned from high school





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