1. Small ice cubes, each of mass 5.60 g, slide down a frictionless ski-jump track in a steady stream, as shown in Figure P6.71. Starting from rest, each cube moves down through a net vertical distance of y = 1.70 m and leaves the bottom end of the track at an angle of 40.0° above the horizontal. At the highest point of its subsequent trajectory, the cube strikes a vertical wall and rebounds with half the speed it had upon impact. If 10.0 cubes strike the wall per second, what average force is exerted on the wall? The attempt at a solution So I was able to find the Vx (because when the cube hits the wall it has Vy=0) with ease using sqrt(2*g*h) * cos 40. Then in order to find the force my goal was to find the momentum and divide it by the time it took the cube to hit the wall which I could solve using the Vyinitial & Vyfinal. This did not work and now I'm stuck in a bit of a rut and am out of ideas.