Q.12The unit of impulse is

The unit of impulse is Newton second (N.s) or, equivalently, kilogram meter per second (kg.m/s).

Here's the step by step explanation:

1. Impulse is defined as the change in momentum of an object when the object is acted upon by a force for an interval of time.

2. The formula for impulse (J) is J = F*t, where F is the force applied and t is the time over which it is applied.

3. The unit of force (F) is Newton (N) and the unit of time (t) is second (s).

4. Therefore, the unit of impulse is Newton second (N.s).

5. Alternatively, since Newton is equivalent to kg.m/s² (kilogram meter per second squared), and we're multiplying it by second (s), the unit can also be expressed as kilogram meter per second (kg.m/s).