The newton-second or newton second (symbol N s or N·s) is the derived SI

Si

Si, si, or SI may refer to :- Measurement, mathematics and science :* International System of Units , the modern international standard version of the metric system...

 unit of impulse and momentum

Momentum

In classical mechanics, linear momentum or translational momentum is the product of the mass and velocity of an object...

. It can also be expressed as the kilogram metre per second (kg·m/s). One newton-second corresponds to a one newton force applied for one second

Second

The second is a unit of measurement of time, and is the International System of Units base unit of time. It may be measured using a clock....

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It can be used to identify the resultant velocity of a mass if a force accelerates the mass for a specific time interval.