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Momentum, impuls, dan kekekalan momentumCukup sering

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A 5 kg5\ \mathrm{kg} object is at rest on a smooth horizontal surface. From t=0t=0 it is acted on by a horizontal force F=3tF=3t (FF in N, tt in s) of fixed direction. Its speed at t=4 st=4\ \mathrm{s} is ( ).
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