A car is moving in a straight line with speed 18 kmhr^–1. It is stopped in 5s by applying the brakes. Find the speed of the car after 2 s of applying the brakes.

Show that the work done in an electric field is independent of path.

Two balls of equal masses are thrown upwards along the same vertical direction at an interval of 2 s with same initial velocity of 39.2 ms^–1. Then find the height at which they collide.

A boy swims in a 100 m long pool. He covers 60 m with a velocity of 20 ms^–1 and covers the rest of the distance with a velocity of 10 ms^–1. Calculate the average velocity of the boy.

A particle is thrown upwards. It attains a height h after 5 s and again after 9s comes back. What is the speed of the particle at a height h?