When a ball hits a wall with a velocity of 50m/s and bounces back with the same speed, what is the change in velocity of the ball?

A car travelling due north at 20 km/hr turns west and travels at -the same speed. What is the change in velocity:

A bullet hits a Sand box with a velocity of 20 m/s and penetrates it up to a distance of 6 cm. Find the deceleration of the bullet in the sand box.

A ball is dropped from the top of a tower. One second later another ball is thrown downwards with a velocity of 15ms^-1 . When and how far below the top will the second stone overtake the first?

Two equal drops of water are falling through air with a steady velocity of 0.1m/s. if the drops coalese, what will be its velocity?

What is the C.G.S and S.I unit of velocity?

A ball of mass 150 gm is thrown vertically upward with a velocity of 10m/sec. What is the momentum at its highest point of ascend?

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 ball is thrown vertically upwards with a velocity of 49 m/s. Calculate the maximum height to which it rises.

A steel ball of radius 2cm is initially at rest.It is stuck head on by another steel ball of radius 4cm moving with a velocity of 0.72ms^-1.Assuming that the collosion in completely inceelastic.Calculate the velocity of the balls after collision.

A motor car travelled 100 km at a velocity of 40 km/h and come back with a velocity of 25 km/h. Find the average speed.