Linear momentum is a vector quantity defined as the product of an object's mass, $m$, and its velocity, $v$. Linear momentum is denoted by the letter $p$ and is called momentum for short. Note that a body's momentum is always in the same direction as its velocity vector. The unit of momentum are kg. m/s. $p =mv$

definition

Unit and formula for momentum

Momentum is a product of mass and velocity.It is denoted as $p$. Momentum has both direction and magnitude. It is a vector quantity. Its direction is same as that of the velocity. $p=mv$ Unit of momentum is $kgm/s$ or $Ns$