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A force of 18 N acts on a particle, of mass 7.5 kg, at an angle of 30 above the horizontal. The particle is on

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A force of 18 N acts on a particle, of mass 7.5 kg, at an angle of 30 above the horizontal. The particle is on a rough horizontal plane. Given that the particle is on the point of slipping, what is the coefficient of friction, between the particle and the plane

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