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Q.

A boat is traveling due east at 12 ms-1. A flag on the boat flaps at 53oN of W. Another flag on the shore flaps due north.

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a

Speed of wind with respect to ground is 16 ms-1

b

Speed of wind with respect to ground is 20 m s-1

c

Speed of wind with respect to boat is 20 m s-1

d

Speed of wind with respect to boat is 16 ms-1

answer is A.

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Detailed Solution

Velocity of air =vj^v→AB=vj^−12i^tan⁡53∘=v12=43v=4×123=16ms−1vAB=(16)2+(12)2=20ms−1
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