Question

a cyclist is moving due east with a velocity of 10 km/h there is no wind air and rain appear to fall at degree vertival calculate the speed of rain.

Joshi sir comment

Question is not submitted properly, angle is not given 

let the angle is θ degree

then v(man) = 10i

and v(rain) = -vj                          i and -j are the directions for man and rain

so v(rain w.r.t. man) = -vj-10i

so tanθ = 10/v so v = 10 cotθ

θ is measured from vertical

 

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