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Question

Rain is falling vertically with a speed of 25m/s . A woman rides a bicycle with a speed of 8m/s in the north to south direction. What is the direction in which she holds her umbrella to protect herself from the rain?

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Solution

The velocity of the cyclist be vc

The velocity of the rain is vr

The relative velocity will be

v=vrvc

v=258m/s

Hence the relative velocity is258m/s

To find the angle of the umbrella

tanθ=vcvr

θ=tan(817)

The angle is43.9


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