KinematicsHard

Question

′A′ and ′B′ are moving along same straight line in opposite direction, each with speed 4 m/s with respect to ground. ′A′ sees that the rain drops are falling vertically while ′B′ sees the rain drops falling at an angle 45o with the vertical. The speed of rain w.r.t ground, is

Options

A.4√2 m/s
B.4√5 m/s
C.4 m/s
D.8 √2 m/s

Solution

≡ 
     
⇒  VRx = VA = 4 m/s ...(i)
⇒ VRy = VRx + vB = 8 m/s ...(ii)
and 
Speed of rain = 4√5 m/s

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