Raindrops are falling with a velocity 10 
m/s making an angle of 45 0 with the vertical. The drops appear to be falling vertically to a man running with constant velocity. The velocity of rain drops change such that the rain drops now appear to be falling vertically with 
times the velocity it appeared earlier to the same person running with same velocity.
(i) The magnitude of velocity of man with respect to ground is
Text Solution
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(i)d (ii)a (iii)b
Sol. In the first case :
From the figure it is clear that
is 10 m/s downwards and
is 10 m/s towards right.
In the second case :
Velocity of rain as observed by man becomes times in magnitude.
∴ New velocity of rain
∴ The angle rain makes with vertical is
tan θ = 
or θ = 30°
∴ Change in angle of rain = 45 – 30 = 15°.
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