7 . A bullet is shot from a submarine which is stationary on the sea level . The path of the bullet above the sea level can be modelled by the function
� � �100 � 1600 , where V m represents the height of the bullet above the
2 V x x sea level , and observer . x m represents the horizontal distance of the bullet from an
( a ) Find x when V attains its maximum . [ 2 ]
( b ) Hence , show that the maximum height of the bullet above the sea level is 900 m .
[ 1 ] ( c ) Find the horizontal distance of the bullet travelled above the sea level .
[ 3 ]
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