Answer:
Speed of plane .
The shell moves along curve . The
plane moves along PL. Let them hit after a time t.
Fig. 4.109
For hitting, horizontal distance
travelled by the plane
= Horizontal distance travelled
by the shell.
or Horizontal velocity of
plane
= Horizontal velocity of shell
or
The shell should be fired at an
angle of with the
horizontal or with
the vertical.
The maximum height of flight of
the shell is
Thus the pilot should fly the plane at a
minimum altitude of 16 km to avoid being hit by the shell.
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