The breaking car had 10,000 J of kinetic energy before breaking after breaking it had 2000 J of kinetic energy. How much thermal energy did the brakes gain?

8000J

Explanation:

The kinetic energy of the car lost during breaking are converted to thermal energy and are gained by the brakes.

Kinetic energy loss by car = thermal energy gained by brakes.

∆K. E = ∆T. E ... 1

The Kinetic energy loss by car can be expressed as;

∆K. E = K. E1 - K. E2

Initial K. E = K. E1 = 10000J

Final K. E = K. E2 = 2000J

∆K. E = 10000J - 2000J = 8000J

From equation 1,

∆K. E = ∆T. E

∆T. E = 8,000J

thermal energy gain by brakes = 8,000J