We know from conservation of momentum (and our currency analogy) that B will also receive an impulse, Δ→pB, that is equal to −Δ→pA. (\(\Delta \vec{p}_B=-\Delta \vec{p}_...We know from conservation of momentum (and our currency analogy) that B will also receive an impulse, Δ→pB, that is equal to −Δ→pA. (Δ→pB=−Δ→pA). However, if a force does depend on time (think of throwing a baseball, or a car crash - the force over the time period of those interactions may not be constant at all), we can still find the impulse delivered by performing an integration,
