A car travels first 30 km with a uniform speed of 60 km h^-1 and then next 30 km with a uniform speed of 40 km h ^-1.

Calculate —

(i) the total time of journey,

(ii) the average speed of the car.

A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km.

Find —

(i) The average speed

(ii) The average velocity of the train

A body starts from rest and acquires a velocity 10 m s ^-1 in 2 s. Find its acceleration.

A car starting from rest acquires a velocity of 180 m s^-1 in 0.05 h. Find the acceleration.