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Two balls with the same mass m are thrown from the same initial point as projectiles....

Two balls with the same mass m are thrown from the same initial point as projectiles. The magnitude of the initial velocity vi of each ball is the same, but ball#1 is thrown upward with an angle ? with the horizontal, and ball#2 is thrown upward with an angle ? with the horizontal, ? < ?. Show that at any altitude where y < ymax-ball#2, the speed of each ball is the same. Remember that each ball passes through the altitude y twice.

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