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## Homework Statement

What is the rate of change of momentum when a constant 4N force acts on a mass of 2Kg for 2 seconds ?

## Homework Equations

change in momentum = impulse produced (on the 2Kg mass) by the force

ie

f*t=δ

**P**

## The Attempt at a Solution

i used the above equation to first find the impule

I,impulse= 4*2=8Ns

as I = δ

**P**

hence δ

**P**/δt = 8/2 = 4 Kg m s^-2

In simple terms as force = rate of change of momentum thus 4N shud be the answer...

but my teacher rejected the answer 4 but instead said that it would be 8