From the ground level, a ball is to be shot with a certain speed. Graph shows the range \( \math....

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From the ground level, a ball is to be shot with a
\( \mathrm{P} \)
certain speed. Graph shows the range \( \mathrm{R} \) it will have
W
versus the launch angle \( \theta \). The least speed the ball will have during its flight if \( \theta \) is chosen such that the flight time is half of its maximum possible value, is equal to (take \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
(1) \( 250 \mathrm{~m} / \mathrm{s} \)
(2) \( 50 \sqrt{3} \mathrm{~m} / \mathrm{s} \)
(3) \( 50 \mathrm{~m} / \mathrm{s} \)
(4) \( 25 \sqrt{3} \mathrm{~m} / \mathrm{s} \)


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