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    4

    A particle of mass 2 kg slides down a rough plane inclined at 30° to the horizontal. The coefficient of friction between the particle and the plane is 0.25. Find the acceleration of the particle.

    30° R F 2g a
    1. R = 2g cos 30° = 16.97 N B1
    2. F = 0.25R = 4.24 N M1
    3. 2g sin 30° − F = 2a M1 A1
    4. a = 2.78 m s−2 A1
    (5) 5/5
    Marked the way examiners do it: M marks for method, A marks for accurate answers.

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