# Physics

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Rather than taking the stairs, Javier gets from the second floor of his house to the first floor by sliding down the banister that is inclined at an angle of 30.0 degrees to the horizontal. If Javier has a mass of 49.1 kg and the coefficient of kinetic friction between Javier and the banister is 0.212, what is the force of kinetic friction impeding Javier's motion down the banister?

• Physics -

F(fr)=μ•N=μ•m•g•cosα

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