Q.

An airplane is flying vertically upwards. When it is at a height of 1000 m above the ground and moving at a speed of 367 m/s., a shot is fired at it with a speed of 567 m/s from a point directly below it. What should be the acceleration of airplane so that it may escape from being hit?

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a

>5 m/s2

b

>10 m/s2

c

<10 m/s2

d

Not possible

answer is B.

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Detailed Solution

V2rel-u2rel=2arelS0 = (200)2-2(arel)(1000)or arel = 20 m/s2
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An airplane is flying vertically upwards. When it is at a height of 1000 m above the ground and moving at a speed of 367 m/s., a shot is fired at it with a speed of 567 m/s from a point directly below it. What should be the acceleration of airplane so that it may escape from being hit?