How Do You Calculate Final Velocities in a Two-Mass Elastic Collision?

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Homework Help Overview

The discussion revolves around calculating final velocities in a two-mass elastic collision, focusing on the application of momentum conservation principles and vector addition.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate total momentum and find angles using inverse trigonometric functions but encounters difficulties with their answers. Some participants question the vector nature of momentum and how to properly sum vectors.

Discussion Status

Participants are actively exploring the problem, with some guidance on the vector aspect of momentum being provided. There is an ongoing inquiry into the correct method for vector addition, indicating a productive direction in the discussion.

Contextual Notes

There appears to be confusion regarding the application of vector addition in the context of momentum, and the original poster's calculations may be influenced by assumptions about the directionality of the vectors involved.

davev
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http://i.minus.com/i7YDkagp0bChQ.png



Homework Equations



p = mv

(v1m1 + v2m2)
Vf = --------------------
(m1+m2)



The Attempt at a Solution



I got that the total momentum was 9.64 by using p=mv for summing m1, v1 and m2, v2. Then I used inverse trig to try to find the angle, but all the answers I submit are incorrect. I'm not sure what way to go here.
 
Last edited by a moderator:
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The momentum is vector, and the momentums sum as vectors.

ehild
 
All the answers are still positive, so I don't understand what you mean.
 
How do you add two vectors?

ehild
 

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