Three stones of equal mass are thrown vertically down from the top of a 200-m high...
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Three stones of equal mass are thrown vertically down from the top of a 200-m high building. The initial velocities for the three stones are 2.0 m/s, 5.0 m/s, and 6.0 m/s. What is the velocity (in m/s) of the center mass of the stones along the vertical direction after 3.0 seconds?
A) -43.9
B) -16.9
C) -101.2
D) -67.5
E) -33.7
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