A canon on a warship fires at a fixed angle 45 degrees. In a battle the ship hides behind a 60 m tall hill. a) What is the minimum firing speed needed to clear the hill (Neglect the air resistance)
b) How far should the ship
be from the base of the hill (point mark as B in the diagram) when it fires the cannon?
c) A Spy sends an instant
message indicating that
the enemy ship is 1400
m away from the base
of the hill (point marked
as B in the diagram) on
the opposite side is
approaching the hill with speed 100 m/s. How long do you have to wait till you fire the cannon to target the enemy ship?