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Question

Rain falling vertically downwards with a velocity of 3kmh1. A person moves on a straight road with a velocity of 4 kmh1 . Then, the apparent speed of the rain with respect to the person is

A
1kmh1
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B
5kmh1
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C
4kmh1
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D
3kmh1
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Solution

The correct option is B 5kmh1
r=rain,g=ground &m=man
vrg=3^j, vmg=4^i
We have, vrm=vrgvmg=4^j4^i
vrm=vrg2+vmg2=32+42=5km/hr

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