An aeroplane is flying vertically upwards with a uniform speed of 500 m/s. When it is at a height of 1000 m above the ground a shot is fired at it with a speed of 700 m/s from a point directly below it. The minimum uniform acceleration of the aeroplane now so that it may escape from being hit ? (g = 10 m/s 2 )
Text Solution
Verified by ExpertsThe correct answer is:
A
Acceleration of shell with respect to plane = g + a (downward)
and speed = 700 – 500 = 200 (upward)
To just escape from being hit
h > 
⇒ 1000 > 
g + a > 20 ⇒ a > 10 m/s 2
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