the angle between velocities of balls becomes 90?

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Two balls are thrown horizontally from the top of a tower with velocities v1​ and v2​ in opposite directions at the same time. After how much time, the angle between velocities of balls becomes 90?
10
Sep
Two balls are thrown horizontally from the top of a tower with velocities v1​ and v2​ in opposite directions at the same time. After how much time, the angle between velocities of balls becomes 90? the angle between velocities of balls becomes 90? Two balls are thrown horizontally from the top of a tower with [...]
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