Name the laws involved in the following situations:
(a) the sum of products of masses and velocities of two moving bodies before and after their collision remains the same.
(b) a body of mass 5 kg can be accelerated more casily 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 for ever.

Answer

(a) Laws conservationof momentum (b) Newton's second law of motion (c) Newton's third law of motion (d) Newton's first law of motion