1. The problem statement, all variables and given/known data Sam, whose mass is 75 kg, straps on his skis and starts down a 50-m-high, 20 degree frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Find his speed at the bottom of the slope using Newton's Law Find his speed at the bottom of the slope using Energy 2. Relevant equations Conservation of Energy F = ma vf^2 = vi^2 + 2ad ME_i = ME_f 3. The attempt at a solution I set up a drawing, found the length of the slope, did the force analysis, and got the following (Newton's Laws part): Length of the slope = 146.19m Force down the slope = m*g*sin(20) = 251.3848N Force of wind up the slope = 200/cos(20) = 212.835 So Fnet = 251.3848-212.835= 38.549 a = Fnet/m = 38.549/75 = .5139 Kinematics: vf*vf = vi*vi + 2(a)(d) vf*vf = 0 + 2(.5139)(146.19) vf = sqrt(150.28) = 12.25 m/s Not sure where I went wrong. As for the energy part, I'm not sure how to approach it.