Physics Two Dimensional Motion Question 72
Question: An aircraft moving with a speed of 1000 km/h is at a height of 6000 m, just overhead of an anti-aircraft gun. If the muzzle velocity of the gun is 540 m/s, the firing angle $ \theta $ for the bullet to hit the aircraft should be
Options:
A) $ 73{}^\circ $ B) $ 30{}^\circ $ C) $ 60{}^\circ $ D) $ 45{}^\circ $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Displacement of aircraft in time t=horizontal displacement of projectile $ \Rightarrow 972\times \frac{5}{18}t=V _{0}\cos \theta .t $
$ \Rightarrow \cos \theta =\frac{54\times 5}{540}=\frac{1}{2}\Rightarrow \theta =60{}^\circ $
BETA
