A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km h^-1, after 2 s, it is 33.6 km h^-1 and after further 2 s, it is 37.2 km h^-1. Find the acceleration of vehicle in m s^-2. Is the acceleration uniform ?

A body, initially at rest, starts moving with a constant acceleration 2 m s ^-2.

Calculate —

(i) the velocity acquired and

(ii) and the distance travelled in 5 s.

A train moving with a velocity of 20 m s^-1 is brought to rest by applying brakes in 5 s. Calculate the retardation.

A train travels with a speed of 60 km h^-1 from station A to station B and then comes back with a speed 80 km h^-1 from station B to station A.

Find —

(i) the average speed, and

(ii) the average velocity of train.