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Question

A ship moves along the equator to the east with a speed 30 km/h. Southeastern wind blows 60 to the east with 15 kmh1. Find the wind velocity relative to the ship.

A
41 kmh1,tan135 North of West
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B
23.7 kmh1,tan113 North of West
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C
37.5 kmh1,tan115 North of West
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D
none of these
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Solution

The correct option is A 41 kmh1,tan135 North of West
Relative velocity is vwvs
(15cos60^i+15sin60^j)30^i

so |V|=37.52+12.992=39.98m/sec

and we know that tanθ=yx
tanθ=12.9937.5=35 in North West

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