Question

define impulse and given its s.i unit

Answer 1

impulse...
definition::: it is the product of force ( f) and time (t) for which it acts . the impulse of a force acting for a short time interval is equal to the change in linear momentum produced over that interval...
I=f*t

the si unit of impulse is N.s

Answer 2

Impulse is the total change in momentum produced during the impact .

Or

Impulse is the product if the average force acting during the impact and the time for which the force acts .

SI unit of impulse is Ns

Hope it will help you

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