Answer:

When a particle moves freely then interacts with another system for a (brief) period and

then moves freely again, it has a definite change in momentum; we define this change as the

impulse I of the interaction forces:

I = pf − pi = ∆p

Impulse is a vector and has the same units as momentum.

When we integrate Eq. 7.2 we can show:

I =

Z tf

ti

F dt = ∆p

Explanation:

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