Posted by **Anonymous** on Sunday, October 7, 2007 at 11:00pm.

From inside your apartment, you watch rain fall straight down at a constant speed of 9 m/s. Your friend L calls you as she is driving toawards the west at a constant of 90 km/hr. What with what velocity does L see the rain fall as she looks out her driver's side window?

I know I'm trying to find the velocity relative to L driving. I just don't know where to start. How would the velocity of the rain change?

- physics -
**Quidditch**, Sunday, October 7, 2007 at 11:19pm
Be sure to take care of units conversions.

From L's point of reference, the rain has the x component from her driving plus the y component of the rain falling. Find the resultant vector.

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**drwls**, Sunday, October 7, 2007 at 11:20pm
The velocity of the rain with respect to someone in the car is the vector sum of the downward rain velocity (9 m/s) and the car's speed, 90000m/3600 s = 25 m/s. Use the Pythagorean theorem for the resultant

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