The speed of a car as a function of time is shown in figure.


Find the distance travelled by the car in 8 seconds and its acceleration.

Answer

B

Explanation

In the inerval 8 sec the velocity changes from 0m/s to 20 m/s. Average accelerationn `=20/8 m/s^2
=2.5 m/s^2 ((change in velocity )/time)

Distance travelled,
`S=ut+ 1/2 at^2
=0+1/2 (2.5)8^2=80m`