Question

o. Calculate the work done by the brakes
of a car of mass 1000kg when it's speed is reduced from 20m/s to 10m/s​

Answer 1

Answer:

(- 150,000) J.

Explanation:

We have to calculate the work done by the brakes when the speed of the car is reduced from 20 m/s to 10 m/s. So, the work done by the brake will be the difference of their kinetic energies. So, the work done by the brakes to reduce the speed of the car from 20 m/s to 10 m/s is (- 150,000) J.