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A man moving with 5 ms^-1 observes rain ...

A man moving with `5 ms^-1` observes rain falling vertically at the rate of `10 m s^-1`. Find the speed and direction of the rain with respect to ground.

A

`5sqrt(5) ms^(-1)`

B

`5 ms^(-1)`

C

`4sqrt(5)ms^(-1)`

D

None of these

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