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Physics

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Mass 1 with a mass of 28.5 kg starts at rest at the top of a frictionless from a height of 17 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is of unknown mass. After the collision, the total kinetic energy of both masses is 60% of the initial total kinetic energy of both masses before the collision. What is the amount of mass 2 in kg?

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