Question

A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maintain pressure on the accelerator to keep the car moving at this speed. What is the net work done on the car over a distance of 250 m?

Answer 1

Since the car moving with constant speed the acceleration equals zero. Then, according to the Newton's Second Law of Motion, the net force acting on the car also equals zero. Finally, by the definition of the work done, we have:

$$W_{net}=Fd=0\cdot250\ m=0.$$

Answer:

$W_{net}=0.$