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A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly

[A].	2 N	[B].	2.5 N
[C].	3 N	[D].	4.5 N
[E].	4.9 N

Answer: Option D

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