Rain is falling vertically downwards with a speed of 4 kmh − 1 . A girl moves on a straight road with a velocity of 3 kmh − 1 . The apparent velocity (in km / hr ) of rain with respect to the girl is

Question

Rain is falling vertically downwards with a speed of 4 kmh − 1 . A girl moves on a straight road with a velocity of 3 kmh − 1 . The apparent velocity (in km / hr ) of rain with respect to the girl is :-

TestHub · Accepted Answer

Velocity of rain with respect to the girl: $v_{RG} = v_{R} - v_{G}$

Rain falls vertically at 4 km/hr and the girl moves horizontally at 3 km/hr; the two vectors are perpendicular:

$∣ v_{RG} ∣ = 4^{2} + 3^{2} = 5 km/hr$

Answer: 5

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