A car is moving in a rainstorm at a speed of 60km/h. The rain drops fall vertically w.r.t the ground with a constant speed of 15m/s. The angle with the vertical at which raindrops strike the car is
A
tan−1109
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B
sin−1109
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C
tan−1910
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D
cos−1109
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Solution
The correct option is Atan−1109
Velocity of car = vc=60km/h=50/3m/s
Velocity of rain drops, vr=15m/s
From the figure, we get tanθ=vcvr=50/315=109 θ=tan−1(109)