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Question

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A 8 kg toy car can move along an x axis. The figure gives Fx of the force acting on the car, which begins at rest at time t = 0. The scale on the Fx axis is set by Fxs = 40 N. What is px at t = 4 s?

Explanation / Answer

Force = mass x acceleration => 40N = 8kg x a => a = 5 N/kg Also v = u + at...............................(Newton… Law of Motion) v = 0m/s + 5 m/s/s * 4s...........(1N/kg = 1m/s/s) v = 20 m/s Since Momentum = Mass * Velocity => Momentum = 5kg x 20 m/s = 100 kgm/s

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