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A particle of mass m, moving along the X...

A particle of mass m, moving along the X-axis collides with a stationary particle of mass `m_2` and deviates by an angle `30^@ ` to the X-axis as shown in the figure. If the percentage change in kinetic energy of the combined system of these two particles reduces by 50%, then the ratio of the masses `m_2/m_1` is

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