A projectile is fired horizontally off a cliff at an initial speed of    metres per second.
 

The projectile strikes the water,   metres from the base of the cliff.

Let be the acceleration due to gravity and assume air resistance is negligible.

1.  Show the projectile hits the water when
    
     (2 marks)
   

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2.  If    equals twice the height of the cliff, at what angle does the projectile hit the water?  (2 marks)
   

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3.  Show that the speed at which the projectile hits the water is
    
     metres per second.  (1 mark)
   

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