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5?? A blue ball is thrown upward with an initial speed of 20 m/s, from a height of 0.5 m above the ground. 2.4

5?? A blue ball is thrown upward with an initial speed of 20 m/s, from a height of 0.5 m above the ground. 2.4 s after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.1 m/s from a height of 23 m above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s.

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