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 bullet initially moving with a velocity 20 m s^-1 strikes a target and comes to rest after penetrating a distance 10 cm in the target. Calculate the retardation caused by the target.

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 train is moving with a velocity of 90 km h^-1. It is brought to stop by applying the brakes which produce a retardation of 0.5 m s^-2.

Find —

(i) the velocity after 10 s, and

(ii) the time taken by the train to come to rest.