Elastic Collisions in One Dimension

G-reg

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?

Related Introductory Physics Homework Help News on Phys.org

ideasrule

Homework Helper
Two things have to be conserved in an elastic collision. One is energy, which you have. What's the other one?

G-reg

And momentum
which would be

m1v1o = m1v1f + m2v2f ???

roflol

you sure it didnt say "inelastic" instead? and what exactly are they asking you to work out : /

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving