(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Objects A and C are made of different materials, with different

“springiness,” but they have the same mass and are initially at

rest. When ball B collides with object A, the ball ends up at rest.

When ball B is thrown with the same speed and collides with

object C, the ball rebounds to the left. Compare the velocities of

A and C after the collisions. Is vA greater than, equal to, or less

than vC?

2. Relevant equations

Pi = Pf

3. The attempt at a solution

A: m_{b}(V_{bi}) = mV_{Af}

B: m_{b}V_{Bi}= m_{b}V_{Bf}+ mv_{Cf}

Now...I can see that:

V_{Af}= m_{b}(V_{bi})/m

V_{Cf}= (m_{b}(V_{bi}) - m_{b}V_{Bf})/m

I don't think I can say, from the above equations which is bigger (VAf or VCf)...do I have to sub one into the other now? How do I continue the solution? Thanks for your help!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Conservation of Momentum Problem

**Physics Forums | Science Articles, Homework Help, Discussion**