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9. An object (A) of mass ma = 28.5 kg is moving in a direction that makes angle of 30° north of east with a speed va = 5.10 m/s,
while object (B) of mass mg = 18.0 kg is moving due south with a speed vB = 7.90 m/s. The two objects collide and stick
together in a completely inelastic collision. Find the magnitude of the final velocity of the two-object system after the collision.
m/s

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