A flag is mounted on a car moving due North with a velocity of $20 k m / h$ . Strong winds are blowing due East with the velocity of $20 k m / h$ . The flag will point in direction:

East

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North-East

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South-East

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South-West

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Solution

The correct option is C South-East
Let us draw a vector diagram(refer diagram) with
$V_{c} =$ Velocity of the car along North.
$V_{w} =$ Velocity of the wind along East.
Thus, velocity of the wind relative to the car $= V_{w} - V_{c}$
Now the resultant of these two vectors give the direction of the flag that is the South-East.
Hence, option C is the correct answer.

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