A fighter jet is flying horizontally at a certain altitude with a… - Vidyadip

MCQ

A fighter jet is flying horizontally at a certain altitude with a speed of $200 \; ms ^{-1}$. When it passes directly overhead an anti-aircraft gun, bullet is fired from the gun, at an angle $\theta$ with the horizontal, to hit the jet. If the bullet speed is $400 \; m / s$, the value of $\theta$ will be $\dots \; {}^o$

A
$40$
B
$50$
✓
$60$
D
$70$

✓

Answer

Correct option: C.

$60$

c
Both should have same horizontal component of velocity

$200=400 \cos \theta$

$\theta=60^{\circ}$

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