Suppose a watermelon with a mass of 2

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Suppose a watermelon with a mass of 2.0 kg undergoes a head-on elastic collision on a frictionless counter with a grapefruit with a mass of 0.8 kg. If the total kinetic energy of the system is 10.5 J and the total momentum is 7.5 kg·m/s, determine the possible initial and final velocities for the watermelon and the grapefruit.