A batsman deflects a ball by an angle of `45^@` without changing its initial speed which is equal to `54 km//h`. What is the impulse imparted to the ball ? (Mass of the ball is 0.15 kg.)

A car is moving with a speed of 54 km//h . What will be the kinetic energy of the boy of mass 40 kg sitting in the car ?

Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m s^-1 collide and rebound with the same speed. What is the impulse imparted to each ball due to the other ?

A 5 kg ball is trhown up with a speed of 10 m/s. What is the height to which it rises?

The driver of a three-wheeler moving with a speed of 36 km//h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle ? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.

What is the de-Broglie wavelength of a ball of mass 0.060 kg moving at a speed of 1.0 m/s.

A player throws a ball upwards with an initial speed of 29.4 m s^-1 :- What are the velocity and acceleration of the ball at the highest point of its motion ?

A ball is thrown from a roof top at an angle of 45^@ above the horizontal. If hits the ground a few second later. At what point during its motion , does the ball have Smallest speed.