The horizontal range is four times the max

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The horizontal range is four times the maximum height attained by a projectile. The angle of projection is ......... $^o$

A

${90}$

B

${60}$

C

${45}$

D

${30}$

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is ......... $^o$

$ R = 4H\cot \theta ,$

if R = 4H then $\cot \theta = 1 \Rightarrow \theta = 45^\circ $

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