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F_f=Force of Friction (F_f=μF_n; F_n=Normal Force)

m=Mass of the truck

U=Potential Energy, U-i= initial U, U_f=final U

L=Length of the ramp

K=Kinetic Energy, K_i=initial K, K_f=final K

W=Work (in this case done by friction)

v=initial velocity of the truck

Looking at the diagram I drew I determined:

F_f=μmg/cosθ

U=Lsinθmg

ΔK=ΔU-W

K_f-K_i=U_f-U_i-W

-K_i=U_f-W

-1/2mv^2=Lsinθmg-(μmg/cosθ)L

-1/2v^2=L(sinθg-μg/cosθ)

-v^2/(2(sinθg-μg/cosθ))=L

Using this process I've gotten the wrong answer, but I don't understand what I've done wrong and how I need to revise it.

Thanks!