Question

On a level road a scooterist applied brakes to slow down from a speed of 10 M per second to 5 M per second if the mass of the scooterist and the scooter B 150 kg calculate the work done by the brakes neglect air resistance and friction

Answer 1

work done is change in kinetic energy

kinetic energy is 1/2 m v^2- u^2
= 1/2 x 150 x (100-25)
= 75 x 75 = 5625 J