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Motion and energy guide source
A 0.5 kg cart starts from rest under a constant horizontal net force of 2 N. Newton’s second law gives a = F / m = 4 m/s². After 3 s, its speed is 12 m/s and its displacement is 18 m. The force does 36 J of work over that displacement, equal to the increase in kinetic energy. If the same net force continues, the cart keeps accelerating; its speed does not stop increasing at 3 s.
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