A projectile is thrown in the upward direction making an angle of \( 60^{\circ} \) with the hori...

Описание к видео A projectile is thrown in the upward direction making an angle of \( 60^{\circ} \) with the hori...

A projectile is thrown in the upward direction making an angle of \( 60^{\circ} \) with the horizontal direction with a velocity of \( 147 \mathrm{~ms}^{-1} \). Then the time after which its inclination with the horizontal is \( 45^{\circ} \), is
(a) \( 15 \mathrm{~s} \)
(b) \( 10.98 \mathrm{~s} \)
(c) \( 5.49 \mathrm{~s} \)
(d) \( 2.745 \mathrm{~s} \)
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