Mathematics · 2021
JEE Main · 24 February 2021, Shift 2 · Q75
The angle of elevation of a jet plane from a point A on the ground is 60^°. After a flight of 20 seconds at the speed of 432 km/hour, the angle of…
The angle of elevation of a jet plane from a point A on the ground is $\displaystyle 60^{\circ}$. After a flight of $\displaystyle 20$ seconds at the speed of $\displaystyle 432$ km/hour, the angle of elevation changes to $\displaystyle 30$°. If the jet plane is flying at a constant height, then its height is :
Official answer
(4)
$\displaystyle 1200 \sqrt{3} \mathrm{~m}$
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