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At aharbour enemy ship is at a distance ...

At aharbour enemy ship is at a distance `180sqrt(3)m` form the security cannot having a muzzle velocity of `60m//s`.
(a) To what angle must the cannot be elevated to hit the ship.
(b) What is the time of flight.
(c ) How for should the ship be moved away from its initial position so that it becomes beyond the range of the cannot `(g = 10m//s^(2))`.

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