12-109. A boy throws a ball at O in the air with a speed
Chapter 12, Problem 12-109(choose chapter or problem)
12-109. A boy throws a ball at O in the air with a speed v0 at an angle 0\. If he then throws another ball with the same speed Vo at an angle O2 < 0\, determine the time between the throws so that the bails collide in midair at B.
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