Rain falling vertically downwards with a velocity of 3kmh−1. A person moves on a straight road with a velocity of 4kmh−1 . Then, the apparent speed of the rain with respect to the person is
A
1kmh−1
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B
5kmh−1
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C
4kmh−1
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D
3kmh−1
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Solution
The correct option is B5kmh−1 r=rain,g=ground &m=man
vrg=−3^j, vmg=−4^i We have, →vrm=→vrg−→vmg=−4^j−4^i vrm=√vrg2+vmg2=√32+42=5km/hr