Define momentum and state its SI unit. State the principle of conservation of momentum.

Ans. Momentum is defined as the product of mass of the body and its velocity. It is also called the total quantity of motion contained in a body. Its SI unit is kg m s-¹.

The principle of conservation of momentum states that if no external force acts on a system in a particular direction, then the total momentum of the system in that direction remains conserved.

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