Did I get this right? (collision in 2-d)

  • Thread starter drewdiddy
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  • #1
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Homework Statement



2 birds of same mass swoop down on a mouse at an angle of 60 deg from horizontal with speed 30 m/s. They collide and stick together, what is their resultant speed?

Homework Equations



Conservation of momentum.

The Attempt at a Solution



This was just on a test I took and I got 26 m/s but I'm thinking it should be just 30 m/s down? Or is some velocity lost during the collision?
 

Answers and Replies

  • #2
tiny-tim
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Or is some velocity lost during the collision?

Hi drewdiddy! :smile:

Momentum is always conserved in collisions (energy isn't).

So your answer was right. :smile:
 
  • #3
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So it should have been 30 m/s instead of the 26 that I wrote? :(
 
  • #4
tiny-tim
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So it should have been 30 m/s instead of the 26 that I wrote? :(

No, your answer was right

momentum is a vector, so you added the two momentums by vector addition, and you got 26 (times 2m). :smile:
 

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