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Q.

A projectile launch speed is five times its speed at maximum height, the launch angle is $θ_{o} = \cos^{- 1} (\frac{1}{x}) .$ The value of x is _____.

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answer is 5.

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Detailed Solution

$5 (u \cos θ) = u \Rightarrow \cos θ = \frac{1}{5} \Rightarrow θ = \cos^{- 1} (\frac{1}{5})$

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