On a horizontal frictionless surface block A (mass 2.00 kg) is sliding toward the east with speed vAi and block B (mass 4.00 kg) is sliding north at speed vBi. The blocks collide and stick together. After the collision the combined object (mass 6.00 kg) is moving at 36.9° north of east at vf = 8.00 m/s.
What was the initial speed vBi of block B?
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