Question

a force of 4 n acting on body of 2kg for 2 s produces a rate of change of momentum ?

Answer 1

Explanation:

Since we are looking for the rate of change of momentum, we don't care how long the force acts. The rate of change of momentum will be the same regardless.  

A force of 4N imparts impulse of 4 per second. That is the rate of change of momentum: 4 per second.  

Since the force is acting on a mass of 2, the velocity will increase by 2 m/s every second. You didn't ask for that. It's extra.

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