The ratio of the speed of a projectile at the point of projection to the speed at the top of its trajectory is $x$. The angle of projection with the horizontal is
The ratio of the speed of a projectile at the point of projection to the speed at the top of its trajectory is $x$. The angle of projection with the horizontal is
- A
$\sin ^{-1}(x)$
- B
$\cos ^{-1}(x)$
- C
$\sin ^{-1}(1 / x)$
- D
$\cos ^{-1}(1 / x)$
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