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A man standing . Observes rain falli...

A man standing . Observes rain falling with velocity of 20 m//s at an angle of `30^@ ` with the vertical
find out velocity of man so that rain appears to fall vertically

Text Solution

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`vecV_(m ) =- v hati ( l e t)`
` vecV_(R ) =- 10 hati - 10 sqrt(3) hatj`
` vecV_(RM ) =- (10 - V ) hati - 10 sqrt(3) hatj`
`implies - (10 -v )=0`
for vertical fall horizontal component must be zero
`(or) v= 10 m//s`
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