A car moves horizontally at 10 m/s while rain falls vertically downward at 10√3 m/s. The rain streaks on its vertical windshield make an angle with the horizontal equal to:
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Question

A car moves horizontally at 10 m/s while rain falls vertically downward at 10√3 m/s. The rain streaks on its vertical windshield make an angle with the horizontal equal to:

G1 Physics · Accepted Answer

Relative rain velocity in the car frame has horizontal component 10 m/s and vertical component 10√3 m/s. Therefore tanθ = (10√3)/10 = √3, so θ = 60°. Hence option C is correct.