A projectile is thrown in the upward direction making an angle of $60^o$ with the horizontal direction with a velocity of $150\, ms^{-1}$. Then the time after which its inclination with the horizontal is $45^o$ is
A projectile is thrown in the upward direction making an angle of $60^o$ with the horizontal direction with a velocity of $150\, ms^{-1}$. Then the time after which its inclination with the horizontal is $45^o$ is
- A
$15\,\left( {\sqrt 3 - 1} \right)\,s$
- B
$15\,\left( {\sqrt 3 + 1} \right)\,s$
- C
$7.5\,\left( {\sqrt 3 - 1} \right)\,s$
- D
$7.5\,\left( {\sqrt 3 + 1} \right)\,s$
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