A wooden block of mass M resting on a rough horizontal floor is pulled with a force F at an angle...

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A wooden block of mass M resting on a rough horizontal floor is pulled with a force F at an angle ϕ with the horizontal. If μ is the coefficient of kinetic friction between the block and the surface, then the acceleration of the block is
(1) F/M(cosϕ-μsinϕ)-μ g
(2) μ F/Mcosϕ
(3) F/M(cosϕ+μsinϕ)-μ g
(4) F/Msinϕ

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