A 500 gram cart rolls with negligible Fashion along a straight flight track at 2.5 m/s until it collided with a 750 gram cart moving to the left at 3.6 m/s. if the two carts stick together, what is the speed of the two cart system after the collision?  A) 1.0 m/s B) 1.2 m/s C) 4.0 m/s D) 12 m/s

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