question_answer

A body is projected at such an angle that the horizontal range is three times the greatest height. The angle of projection is                          [AIIMS 1998; DPMT 2000]

A)             \[{{25}^{o}}{8}'\]  

B)             \[{{33}^{o}}{7}'\]

C)             \[{{42}^{o}}{8}'\]  

D)             \[R=4H\cot \theta ,\]if R=\[3H\]then \[\cot \theta =\frac{3}{4}\]Þ \[\theta =53{}^\circ 8'\]