A 0.500-kg ball is dropped at t = 0 from a height of 25 m above the ground.  At the same time a second ball (m = 0.250 kg) is thrown straight up from the ground with an initial speed of 15.0 m/s.  The two balls pass each other by without colliding.  At t = 2.00 s, what is the height of the center of mass of the two-ball system above the ground? Group of answer choices a. 7.1 m b. 11.2 m c. 4.3 m d. Cannot be determined with the given information e. 2.9 m

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