Question

A 200 kg motorcycle initially moving at 20 m/s applies its brakes. How

much work was done to stop the motorcycle?

Answer 1

-40,000 J

Step-by-step explanation:

Initial kinetic energy E1 = mv^2/2 = 200*20^2/2 = 40,000 J

Final kinetic energy E2 = 0

Work done = E2 - E1 = -40,000 J