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Two particles of different masses projec...

Two particles of different masses projected from a tower with same speed horizontally but in opposite directioin. One particle of mass `3kg` follows a path `y=-(x^(2))/20` and C.O.M. of the system also follows a path `y=-5/4x^(2)` in the same direction as `3kg` particle. Then find unknonw mass (in kg)

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