Horizontal veolocity given vertical velocity and angle

  • #1

Homework Statement


A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 8.7 m/s relative to the ground. When the train moves at a constant velocity, the raindrops make an angle of θ = 67° when they move past the window as the drawing shows. How fast is the train moving?



Homework Equations


Vx = V0x +axt


The Attempt at a Solution


3.4 and 22.3 m/s are both incorrect.

Couldn't figure out how to do it since clearly you don't just use the Pythagorean Theorem... walk me through it?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Hi IAmSparticus! :wink:

You'd only use Pythagoras if you wanted the length of the third side.

But you only want the angle … so use cos or sin or tan. :smile:
 

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