Question

The speed of a car as a function of time is shown in figure (3-E1). Find the distance travelled by the car in 8 seconds and its acceleration.

Answer 1

In the interval 8 sec the velocity changes from 0 to 20 m/s.
Average acceleration = 20/8 = 2.5 m/s2 (change in velocity)
Distance travelled S = ut + 1/2 at²
                     ⇒  0 + 1/2(2.5)8² = 80 m.