a person walking in  rain feels the velocity o the rain as twice to his velocity. At which anglehe should hold the umbrella with vertical if he moves forward , if it id raining vertically downwards

Dear Student ,
Let the angle with the vertical be = Ф

Therefore ,
tan Ф = velocity of the person / velocity of rain
           = 1/2 
 
 angle Ф = tan ⁻¹ 1/2   

Regards

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