(ii)
A ball, thrown into the air from a building 60 metres high, travels along a path
given by 
2
( )
60
x60
h x
x
=
+
−
, where x is the horizontal distance from the building
and h(x) is the height of the ball What is the maximum height the ball will
reach (iii)
An Apache helicopter of enemy is flying along the path given by the curve
f (x) = x2 + 7 A soldier, placed at the point (1, 2), wants to shoot the helicopter
when it is nearest to him