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SERPSE$109.$XP$.016.$

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Small ice cubes, each of mass $5\mathrm{.}80$ g $,$ slide down a frictionless track in a steady stream, as shown in the figure below. Starting from rest, each cube moves down through a net vertical distance of $h=1\mathrm{.}50$ m and leaves the bottom end of the track at an angle of $40\mathrm{.}0$ 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 $25$ cubes strike the wall per second, what average force is exerted upon the wall?

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