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A fighter plane flying horizontally at a...

A fighter plane flying horizontally at an altitude of 1.5 km with speed 720 km `h^(-1)` passes diretly overhead an anti-aircraft gun. At what angle from the vertical should the gun he fired for the shell with muzzle speed 600 m `s^(-1)` to hit the plane. (Take g = 10 m `s^(-1)`)

A

`sin^(-1) (1/3), 16 km `

B

`cos^(-1)(1/3) , 18 km `

C

`sin^(-1)(1/3), 6 km `

D

`cos^(-1)(1/3) , 6 km`

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The correct Answer is:
A
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