KVPY SA Exam 2012 Question Paper

Question : 19 of 80

Marks: +1, -0

A boat crossing a river moves with a velocity v relative to still water. The river is flowing with a velocity

v/2

with respect to the bank. The angle with respect to the flow direction with which the boat should move to minimize the drift is

Solution:

To minimize the drifting

\sinθ=\v_\w/\v_\bw=1/2

θ=30°

90º + θ = 120º

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