The box, with a mass of 4kg and initially at rest, is pulled for 10 m across a level, frictionless floor by a force of 20.0 N. What is the final speed of the box? F = 20N 10.0 m/s 14.1 m/s 7.1 m/s 50.0 m/s m = 4kg d = 10 m
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