A small block of mass m1 = 200g slides across a horizontal surface without friction with a speed u1 = 2m / s and collides head-on with another block of mass m2 = 400gr, which is initially at rest (u2 = 0) on the same surface. Determine: a) The speed of each block after impact if the collision is elastic. b) The speed of both blocks if after the collision they remain united.

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