Question

the impulse - momentum change theorem is a direct result of ...
newtons law of gravity
newtons 2nd law of motion
newtons 3rd law of motion

Explanation:

The Impulse - Momentum Change Theorem ($J=\Delta p$, where $J$ is impulse and $\Delta p$ is change in momentum) is derived from Newton's 2nd Law of Motion ($F = ma=\frac{\Delta p}{\Delta t}$, and $J = F\Delta t$). Newton's Law of Gravity deals with gravitational force between masses. Newton's 3rd Law is about action - reaction pairs.

Answer:

B. Newton's 2nd Law of Motion