-- Extended --

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Define momentum as mass × velocity; recall and use the equation p = mv.

Define impulse as force × time for which force acts; recall and use the equation impulse = FΔt = Δ(mv).

Apply the principle of the conservation of momentum to solve simple problems in one dimension.

Define resultant force as the change in momentum per unit time; recall and use the equation F = Δp/Δt.