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The equation of motion is (in vector form)
vector( ma) = vector (m•g) + vector F(fr)+ vector N
Projections on the axes
x: m•a = m•g•sinα - F(fr)
y: 0 = N - m•g•cosα
F(fr) =k•N = k• m•g•cosα
a = g•( sinα - k•cosα)
s =Vo•t +at^2/2.