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Question

Rain is falling vertically with a speed of 123 m/s. A woman rides a bicycle with a speed of 12 m/s in East to West direction. What is the velocity of rain relative to the woman? ( <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Eastward and upward are positive x-axis and y-axis respectively)

A
(123^i+12^j) m/s
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B
(123^i+123^j) m/s
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C
(12^i+123^j) m/s
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D
(12^i123^j) m/s
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Solution

The correct option is D (12^i123^j) m/s

Let West to East direction be positive x – axis and upward direction be positive y – axis.
Therefore,
Velocity of rain fall w.r.t ground vR=123^j m/s
Velocity of bicycle w.r.t. ground vW=12^i m/s
So, velocity of rain w.r.t bicycle, vRW=vRvW=123^j(12^i)=(12^i123 ^j) m/s

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