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Find the angle of projection for a proje...

Find the angle of projection for a projectile motion whose rang `R` is (n) times the maximum height `H`.

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Given `R=etaH, (u^(2) sin 2theta)/(g)= eta (u^(2) sin^(2) theta)/(2g) tan theta=4/eta theta=tan^(-1) (4/eta)`.
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