A ball is to be shot from level ground with a certain speed. The figure shows the range R it will have versus the launch angle θ0. The value of θ0 determines the flight time; let tmax represent the maximum flight time. What is the least speed the ball will have during its flight if θ0 is chosen such that the flight time is 0.320tmax?

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" The figure shows the range R it will have versus the launch angle θ0."
which figure?

|dw:1433232959111:dw|

the highest peak is at 240 :)

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