A particle of mass 2.5kg is acted upon by a 20N force. The plane is rough and the particle is
on the point of sliding up the plane.
(i) Show that the coefficient of friction is 0.527. [2]
If the 20N force is now removed, determine
(ii) whether or not the particle will slide down, [2]
(iii) find the acceleration of the particle down the plane if the inclination of the plane is
increased to 40 .
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