# Find the velocity of the rain with respect to the car and the Earth

I would like to confirm the answer to this question.

A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 75.0° with the vertical. Find the velocity of the rain with respect to the car and the Earth.

Thanx.

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You mean relative motion :tongue2:

You have 3 frames of reference: one attached to the rain, another one to the car and the last one to the Earth. Using Galilean Transformations and basic trigonometry you should be able to solve it...

GDogg said:
You mean relative motion :tongue2:

You have 3 frames of reference: one attached to the rain, another one to the car and the last one to the Earth. Using Galilean Transformations and basic trigonometry you should be able to solve it...
You don't even need any Transformations, just use trigonometry. You can construct a right angled triangle.

Regards,

Galileo
Homework Helper
I'd solve this in the car's frame of reference. The vertical component of the raindrop velocity is the same for the car and earth. So you just have to figure out the horizontal component. It's not that hard.

unsure still. horizontal component or vertical

I tried. But which is which? Is the horizontal component the speed relative to the car or the what?
pls help! I really suck at this!

Andrew Mason