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## Homework Statement

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?

## Homework Equations

Pi = Pf

## 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!