State whether momentum is scalar or vector.

Name the laws involved in the following situations:

(a) The sum of products of masses and velocities of two moving bodies before abd after their collision remains the same.

(b) A body of mass 5 kg can be accelerated more easily by a force than another body of mass 50 kg under similar conditions

(c) When person A standing on roller skates pushes another person B (also standing on roller skates) and makes him move to the right side, then the person A himself gets moved to the left side by an equal distance.

(d) If there were no friction and no air resistance, then a moving bicycle would go on moving forever.

If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, it moves upwards. Why?

Why would an aircrafts be unable to fly on the moon?

A boy of mass 50 kg standing on ground exerts a force of 500 N on the ground. The force exerted by the ground on the boy will be:

A. 50 N B. 25000 N

C. 10 N D. 500 N

If someone jumps to the shore from a boat, the boat moves in the opposite direction. Why?

Write or false for the following statements:

Action and reaction act on the same body.