Question

A fighter plane is flying horizontally at an altitude of 1.5 km with speed 720 km/h. At what angle of sight (w.r.t. horizontal) when the target is seen, should the pilot drop the bomb in order to attack the target than?

• A. $23°4^{\prime }$
• B. $43°4^{\prime }$
• C. $33°4^{\prime }$
• D. $53°4^{\prime }$

Answer 1

Answer: (A)

$23°4^{\prime }$

Time & flight $=t=\sqrt{\frac{2s}{a}},a=g$

Than $H=vt=720km/h\times \sqrt{\frac{2\times 1500m}{9.8m/se{c}^2}}$

$=3.5km$

$\tan \theta =\frac{1.5}{3.5}km=.428$

$\theta ={\tan }^{-1}.428={23.17}^{\circ }$

$\simeq {23}^{\circ }{4}^{\prime }$