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Rain is falling vertically downward with...

Rain is falling vertically downward with velocity 4 m//s. A man is moving horizontally with velocity 3 m//s, the velocity of rain with respect to man is

A

`sqrt13 km//hr`

B

`sqrt7 km//hr`

C

`sqrt (109) km//hr`

D

`13 km//hr`

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The correct Answer is:
D
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