A man moves on a straight road with a velocity of 3 km/h. Rain is falling vertically with a speed of 33 km/h. At what angle with vertical should the man hold his umbrella to protect himself from rain water?
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a
45o
b
30o
c
60o
d
37o
answer is B.
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Detailed Solution
ωc know, VR→=Vm→+V →R/mThe velocity triangle is as shown in figure. ∴tanθ=VmVR=333⇒θ=30o