At what angle to the horizontal should a ball be thrown so that its range \( \mathrm{R} \) is re...

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At what angle to the horizontal should a ball be thrown so that its range \( \mathrm{R} \) is related to the time of flight \( \mathrm{T} \) as \( \mathrm{R}=5 \mathrm{~T}^{2} \) ? Take \( \mathrm{g}=10 \mathrm{~ms}^{-2} \) :
- (1) \( 30^{\circ} \)
(2) \( 45^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 90^{\circ} \)
\( \mathrm{P} \)
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