Rain drops hitting the side windows of a car in motion often leave diagonal streaks,why?

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Rain drops hitting the side windows of a car in motion often leave diagonal streaks,why?

Question: Rain drops hitting the side windows of a car in motion often leave diagonal streaks,why?

Answers: 

Rain drops hitting the side windows of a car in motion often leave diagonal streaks because of the relative velocity of rain with respect to the moving car.This relative velocity of rain with respect to rain makes an angle with vertical.

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