A constant force of 6 N acts on a stationary 1 kg body, bringing it to speed 30 m s⁻¹. How long does the force act?
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A constant force of 6 N acts on a stationary 1 kg body, bringing it to speed 30 m s⁻¹. How long does the force act?

G1 Physics · Accepted Answer

Newton's second law gives a=F/m=6 m s⁻². With initial speed zero, v=at; therefore t=30/6=5 s. Answer: B.