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Elastic Collisions in One Dimension

  • Thread starter G-reg
  • Start date
44
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1. Homework Statement
A cart with mass 310 g moving on a frictionless linear air track at an initial speed of 1.4 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.64 m/s.


2. Homework Equations

(1/2)m1vo^2 +(1/2)m2vo^2 = (1/2)m1vf^2 + (1/2)m2vf^2


3. The Attempt at a Solution

(310)(1.4)^2 + 0 = (310)(.64)^2 + m2vf^2

(310)(1.4)^2 - (310)(.64)^2 = m2vf^2

but I feel like I need vf to find m2 so how am I supposed to go from here?
 

ideasrule

Homework Helper
2,266
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Two things have to be conserved in an elastic collision. One is energy, which you have. What's the other one?
 
44
0
And momentum
which would be

m1v1o = m1v1f + m2v2f ???
 
1
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you sure it didnt say "inelastic" instead? and what exactly are they asking you to work out : /
 

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