Hard
Question
A plane flying horizontally at a height of 1500 m with a velocity of 200 ms-1 passes directly overhead an antiaircraft gun. Then the angle with the horizontal at which the gun should be fired for the shell with a muzzle velocity of 400 m s-1 to hit the plane, is -
Options
A.90o
B.60o
C.30o
D.45o
Solution
To hit 400 cos θ = 200
{∵ Both travel equal distance along horizontal, of their start and coordinates of x axis are same}
⇒ θ = 60o Ans.
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