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Fort Gaines guards the western entrance to Mobile Bay. In order to prevent enemy ships from passing, it needs to be able to cover about

Fort Gaines guards the western entrance to Mobile Bay. In order to prevent enemy ships from passing, it needs to be able to cover about 1 km of the bay with cannon fire. The cannons fire projectiles horizontally at a speed of 460 m/s. How high must the cannons be located above the ground in order for their projectiles to travel 1 km horizontally

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