# kilogram metre per second

##### SI coherent derived unit
Name Symbol Derived quantity
kilogram metre per second kg m s−1 momentum

### Definition

The kilogram metre per second, symbol kg m s−1, is the SI coherent derived unit of momentum.

The kilogram metre per second, is equivalent to the unit newton second, symbol N s.

$\text{kg} \ \text{m} \ \text{s}^{-1} = \text{N} \ \text{s}$

### Momentum

In Newtonian mechanics, momentum, or linear momentum, is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction in three-dimensional space.

If m is an object’s mass and v is its velocity (a vector), then the momentum p is:

$p=mv$

Newton’s second law of motion states that a body’s rate of change in momentum is equal to the net force acting on it.