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.

A car travels a distance 100 m with a constant acceleration and average velocity of 20 m s^-1. The final velocity acquired by the car is 25 m s^-1.

Find:

(i) the initial velocity and

(ii) acceleration of car.

When brakes are applied to a bus, the retardation produced is 25 cm s^-2 and the bus takes 20 s to stop.

Calculate —

(i) the initial velocity of bus, and

(ii) the distance travelled by bus during this time.