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Question

Rain is falling vertically with a speed of 35 ms1. Winds start blowing after some time with a speed of 12 ms1 in an east to west direction. In which direction should a boy wait at a bus stop holding his umbrella?

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Solution

Speed of rain=3m/s
Wind speed=12m/s

AD=AB+ACAD=(35)2+122=1225+44=37tanθ=3512,θ=71
Rain is falling at an angle of 71° from horizontal.

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