Speed in direction?

Classical Mechanics Level 3

A boat is moving towards east with velocity 4 m/s 4 \text{ m/s} with respect to still water and river is flowing towards north with velocity 2 m/s 2\text{ m/s} and the wind is blowing towards north with velocity 6 m/s 6\text{ m/s} . The direction of the flag blown over by the wind hoisted on the boat is?

North-west North t a n − 1 1 2 tan^{-1}\frac{1}{2} with east South-east None

Tanishq Varshney by Tanishq Varshney , 23, India

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2 solutions

Nguyen Thanh Long
Apr 16, 2015

Because boat is moving toward east, it makes wind flowing to the west, so flag is effecting by two forces in two directions west and north. Hen it blown over by the : N o r t h − w e s t North-west

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Bob Yang
Jul 6, 2015

The flag moves at 4 m/s west, because the boat is moving east at 4 m/s. The boat is also moving north at 2 m/s, and the wind is blowing towards the north, so 6-2 is 4 m/s north, so it is north-west.

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