A stationary man observes that the rain is falling vertically downward. When he starts running with a velocity of 12km/h, he observes that the rain is falling at an angle 60∘ with the vertical. The actual velocity of rain is
A
12√3km/h
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B
6√3km/h
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C
4√3km/h
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D
2√3km/h
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Solution
The correct option is C4√3km/h Let −→Vm be the velocity of the running man. Let the velocity of the rain be →Vr
From the figure, we can say tan60∘=|−→Vm||→Vr| √3=12|→Vr| ∴|→Vr|=4√3km/h