and the
flag on the mast of a boat anchored in the harbour flutters along the N-E
direction. If the boat starts moving at a speed of 
to the
north, what is the direction of the flag on the mast of the boat ?
Answer:
When the boat is stationary, the flag
flutters along N-E direction. This shows that velocity of the wind is along N-E
direction. When the boat moves, the flag flutters along the direction of
relative velocity of wind w.r.t the boat. Thus 
wind velocity
due N-E
direction
Boat velocity 
due
north
Fig. 4.106
Relative velocity of wind w.r.t.
boat is given by
Clearly, the flag will flutter
in the direction of 
on
the mast of the moving boat.
Angle between 
and 
If 
makes
angle 
with 
then
or 
Angle w.r.t east direction 
Hence the flag will flutter almost in
the east direction.
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