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The eqn I used to sum the forces in the x-direction is:

EFx= Fcos(theta) - mgsin(theta) = 0

F = (mgsin(theta))/cos(theta) = 8935.3N

12.4km/h = 3.44m/s

d/v=t

350m/3.44m/s = t = 101.74s

W = F*s = (8935.3N)(350m)

W = 3127356.9 J

Power = W/dt = 3127356.9J/101.74s

P=3.07*10^4 W

However, this is not right. I feel like I need to include the force in the y-direction in my work equation, but then again perpendicular forces do now work. Does anyone have any idea what I may be overlooking here?