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A sphere of mass m1 moving with a veloci...

A sphere of mass `m_1` moving with a velocity `v_o` hits a sphere of mass `m_2` that is at rest. The collision is absolutely elastic "and central. The velocities of the spheres after collision are `u_1 and u_2`, respectively. What are the mass ratios for the following values of velocities: `u_1=0, u_1 lt 0, and u_1 gt 0 ?`

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