Posted by Alexandra on Wednesday, December 9, 2009 at 2:57am.
I would compute the kinetic energy at the bottom as (P.E. loss) - (work done against friction). Then use KE to get velocity.
Work done against friction is 3.5 * 11 -= 38.5 J
P.E. loss is M g H = 20*9.81*3.5 sin 15 = 50.8 J
K.E. at bottom = 12.3 J = (1/2) M V^2
Solve for V
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