While landing at an airpot, a point made of depression of 20 . Average speed of the plane was 200 km/hr. The plane reached the ground after 54 seconds. Find the height at which the plane was when it started landing.

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Solution

Speed of plane $= 200 k m / h r = 54 s e c o n d s$
$sin 20 ° = 0.342 = \frac{342}{1000} = \frac{1}{H}$
Let P $+ 342 m a n d n = 1000 m$
$D i s t a n c e = S p e e d \times T i m e = 200 \times \frac{5}{18} \times 54 = 3000 m H = 1000 x = 3000 m ∴ x = 3 m P = 34.2 x = 34.2 \times 3 = 1026 m$

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While landing at an airpot, a point made of depression of 20 . Average speed of the plane was 200 km/hr. The plane reached the ground after 54 seconds. Find the height at which the plane was when it started landing.

Speed of plane=200km/hr=54secondssin20°=0.342=3421000=1HLet P+342mandn=1000mDistance=Speed×Time=200×518×54=3000mH=1000x=3000m∴x=3mP=34.2x=34.2×3=1026m

Speed of plane $= 200 k m / h r = 54 s e c o n d s$
$sin 20 ° = 0.342 = \frac{342}{1000} = \frac{1}{H}$
Let P $+ 342 m a n d n = 1000 m$
$D i s t a n c e = S p e e d \times T i m e = 200 \times \frac{5}{18} \times 54 = 3000 m H = 1000 x = 3000 m ∴ x = 3 m P = 34.2 x = 34.2 \times 3 = 1026 m$