Rain appears to fall vertically or a man walking at 3 kmh -1 but if he doubles his speed to the rain appears to fall at 45 o . The real velocity of rain is
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Verified by ExpertsThe correct answer is:
A
Here 
equal to 3 
is the velocity of man 
is the velocity of rain.
PQ is velocity of rain relative to man. In the second case, 
equal to 6 
is the new velocity of man and 
= new velocity of rain relative to man.
Now OQ 2 = OP 2 + PQ 2
or OQ 2 = 3 2 + 3 2 ( Q PQ = PR = 6 – 3 = 3)
or OQ = 3 √ √ 2 kmh -1
tan θ θ = PQ/OQ = 3/3 = 1 or Q = 45 o
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