kilogram metre per second

SI coherent derived unit

Name	Symbol	Quantity	Base units
kilogram metre per second	kg m s⁻¹	momentum	kg m s⁻¹
The kilogram metre per second, symbol kg m s⁻¹, is the SI coherent derived unit of momentum. An object with a mass of one kilogram travelling at a velocity of one metre per second has a momentum of one kilogram metre per second.
Definition			h c^-1 Δν_Cs
$1 \mspace{4mu} \text{kg} \mspace{4mu} \text{m} \mspace{4mu} \text{s}^{-1} \mspace{6mu} = \dfrac{299 \mspace{4mu} 792 \mspace{4mu} 458}{(6.626 \mspace{4mu} 070 \mspace{4mu} 15 \times 10^{-34})(9 \mspace{4mu} 192 \mspace{4mu} 631 \mspace{4mu} 770)} \mspace{6mu} \dfrac{h \mspace{4mu} \Delta \nu _{Cs}}{c}\\ \\ \\ 1 \mspace{4mu} \text{kg} \mspace{4mu} \text{m} \mspace{4mu} \text{s}^{-1} \mspace{6mu} \approx 4.921 \mspace{4mu} 809 \mspace{4mu} 606 \mspace{4mu} 482 \mspace{4mu} 064 \mspace{4mu} 722 \times10^{31} \mspace{6mu} h \mspace{4mu} c^{-1} \mspace{4mu} \Delta \nu _{Cs}$

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.