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A man is walking on a road with a veloci...

A man is walking on a road with a velocity of `3km/h` . Suddenly rain starts falling . The velocity of the rain is `10 km/h` in vertically downward direction. The relative velocity of the rain is

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Rel. velocity of rain w.r.t man is.
`sqrt(3^2+10^2) = sqrt(109) (cm)/h)`
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