A girl riding a bicycle with a speed of 5 m s -1 towards north direction, observes rain falling vertically down. If she increases her speed to 10 m s -1 , rain appears to meet her at 
to the vertical. What is the speed of the rain?
Text Solution
Verified by ExpertsA
Assume north to be 
directions and vertically upwards to be 
directions
Let the velocity of rain be
In the first case, 
= velocity of girl = 
Since rain appears to fall vertically downwards.
a – 5 = 0 or a = 5
In the second case
Since rain appears to fall at 
with the vertical
b = -5
The velocity of the rain is 
Speed of the rain is
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