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When an object having a mass is moving with certain velocity, it is said to have momentum.

It is denoted by P.

Thus, P = mv

where m is mass and v is velocity.

Its SI (MKS) Unit is kg m/s .

Its dimensional formula is [M¹L¹T⁻¹].

E.g. Suppose a car having mass of 1000 kg is moving with a velocity of 72 km/h (20 m/s), then its momentum is:

P = mv

= 1000 * 20

= 20,000 kg m/s

The above explanation is for Linear Momentum. There are also other types of momentum like Angular Momentum.