A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m s ^-1 to 20 m s ^-1 in 3 s . What is its acceleration ?

A toy car initially moving with a uniform velocity of 18 km h^-1 comes to a stop in 2 s. Find the retardation of the car in S.I. units.

A car is moving with a velocity 20 m s ^-1 . The brakes are applied to retard it at a rate of 2 m s ^-2. What will be the velocity after 5 s of applying the brakes ?

A bicycle initially moving with a velocity 5.0 m s ^-1 accelerates for 5 s at a rate of 2 m s^-2 . What will be its final velocity?