Hello. I have questions about physics.

You are going 30 m/s in a car of mass 1000 kg when you reach a red light and stop your car.

a. How much heat energy is released by the brakes of your car? (1 point)

b. If your car could recapture 40% of the heat energy released from your brakes, how much energy would you recapture? (1 point)

c. Imagine that you have an electric car and all of the recaptured energy is put back into the battery that powers your car. What speed could your car achieve from rest by using only the recaptured energy from part (b)? (1 point)

d. If you brake from the speed in part (c) and then start again from rest, how fast will you be able to drive? (1 point) e. An advertisement says that if you have regenerative brakes like these, you'll never have to put any more energy into your car again. Is this true or false? Explain your answer. (1 point)

Thank you!