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18. Two small discs of masses m, and m. ...

18. Two small discs of masses m, and m. are connected by a weightless spring resus smooth horizontal plane. When the spring is in natural length the discs are se with initial velocities vi and v2, whose directions are mutually perpendicular and in the same horizontal plane. Find the total energy E of the system with reference to the frame fixed to the centre of mass.

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