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I first tried to find velocity (V) to use in a DKE equation

D=delta

My equation for V was sqrt((2(m2ghi-m1ghf+um1gdcos@))/(m1+m2))

u = coefficient of kinetic friction

hi = initial height, 20m in this case

hf = 20sin@

@ = theta

I then used DKE = 0.5m1Vf^2-0.5m1Vi^2

where Vi = 0

Using this method I got an answer of DKE of 5059.76J, which was wrong.

I do not know if I am over simplifying the problem or thinking too much or if I'm completely thinking in the wrong direction. Help would be much appreciated.