physics

A 22.0 kg box is sliding down on an incline set at (44) degrees up from horizontal. The coefficient of kinetic friction between the box and the incline is (.27). Find the acceleration of the box. Give your answer in m/s2 and with 3 significant figures.

asked by l
  1. mass does not matter, call it m

    normal force = m g cos 44
    max friction force up slope = .27 m g cos 44

    gravity force down slope = m g sin 44
    so

    m g sin 44 - .27 m g cos 44 = m a

    (sin 44 - .27 cos 44) 9.81 = a

    posted by Anonymous

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