A small car of mass 500 kg is rolls forward to the right 20 m, if a braking force is applied

backwards to slow the car, what is the work done by the braking force?

Answer: 98000J

Explanation:

Mass of small car (m) = 500 kg

Distance moved (h) = 20 m

work done by the braking force = ?

Work is done when force is applied on an object over a distance, hence Workdone = force x distance

(since force is the product of mass (m) and acceleration due to gravity (g), where g is 9.8m/s2)

Thus, Workdone = mgh

Workdone = 500 kg x 9.8m/s2 x 20 m

= 98000J

Thus, the work done by the braking force is 98000 joules