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Questions  

 Rain is falling vertically with a velocity of 25 ms-1. A woman rides a bicycle with a speed of 10 ms-1 in the north to south direction. What is the direction (angle with vertical) in which she should hold her umbrella to safe herself from rain?

a
tan−10.4
b
tan−11
c
tan−13
d
tan−12.6

detailed solution

Correct option is A

Here, vR = 25 ms-1, vw= 10 ms-1            Velocity of rain w.r.t. woman :            Let vRvw make an angle θ with verticaltanθ=vWvR=102.5=0.4She should hold her umbrella at an angle of θ = tan-1(0.4) with the vertical towards south.

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