Before collision, block A with mass 1 kg, velocity 5 m/s and block B with mass 2 kg, on a floor are moving towards each other along the x axis. They collide, stick together and move with velocity -2 m/s after collision: (a) Assuming the floor is frictionless, find the velocity of block B before the collision; (b) If the floor is not frictionless, what additional information is required to determine the velocity of block B right before the collision?
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