A force of 4 N acts on a 2 kg mass for 3 s. What is the change in momentum?

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Multiple Choice

A force of 4 N acts on a 2 kg mass for 3 s. What is the change in momentum?

Explanation:
Change in momentum comes from the impulse delivered by a force. Impulse equals force times the time the force acts, so Δp = F × Δt. Here the force is 4 N acting for 3 s, giving an impulse of 4 × 3 = 12 N·s. Since 1 N·s is 1 kg·m/s, the change in momentum is 12 kg·m/s, in the direction of the applied force. The mass isn’t needed to find this impulse, though it would matter if you linked the momentum change to a velocity change later.

Change in momentum comes from the impulse delivered by a force. Impulse equals force times the time the force acts, so Δp = F × Δt. Here the force is 4 N acting for 3 s, giving an impulse of 4 × 3 = 12 N·s. Since 1 N·s is 1 kg·m/s, the change in momentum is 12 kg·m/s, in the direction of the applied force. The mass isn’t needed to find this impulse, though it would matter if you linked the momentum change to a velocity change later.

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