A man starts running along a straight ro...

A man starts running along a straight road with uniform velocity observes that the rain is falling vertically downward. If he doubles his speed, he finds that the rain is coming at an angle `theta` to the vertical. The velocity of rain with respect to the ground is :

ui-uj

`ui-(u)/(tan theta) hatj`

`2uhatj+ucotthetahatj`

`ui+usinthetahatj`

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