Лаг1989 задача №3.28

Particles 1 and 2, whose mass ratio = 1/2, moving in the XY plane, experienced an absolutely inelastic collision. The radius-vectors of particles before the collision changed over time according to the laws: r₁=3t·i 4t·j, r₂=t·i 2t·j. Find the speed u of the formed particle.

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