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A man is walking on a road with a veloci...

A man is walking on a road with a velocity of `3km/h` . Suddenly rain starts falling . The velocity of the rain is `10 km/h` in vertically downward direction. The relative velocity of the rain is

A

`sqrt 13 km/h`

B

`sqrt 109 km/h`

C

`sqrt 7 km/h`

D

`sqrt 13 km/h`

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The correct Answer is:
B
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