Velocity of an object of mass 5kg increases from 3m/s to 7m/s on applying a force continuously for 2s. Find out the force applied. If the duration for which force acts is extended to 5s, what will be the velocity of the object then?

An object starting from rest travels with an acceleration of 5 m / s^2 . What will be its velocity after 3s?

Suppose a child of mass 40 kg running on a horizontal surface with a velocity of 5m/s. Jumps on a stationary skating board of mass 3kg while running. If there is no other force acting horizontally (assuming the frictional force on the wheels to be zero), calculate the velocity of the combined system of child and the skating board.

If the velocity of a car moving with uniform velocity changes from 20m/s to 40m/s in 5s What is the acceleration of the car?