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## Homework Statement

A ball rolls at a velocity of 3.5m/s toward a 5.0kg ball at rest. They collide and stick and move off at 2.5 m/s. What was the mass of the moving ball?[/B]

## Homework Equations

P

_{a}+ P

_{b}= 0

M(a)V(a) = - M(b)V(b)[/B]

## The Attempt at a Solution

So.. The ball at rest had zero momentum... Therefore how are we supposed to find the momentum in total if we are only given 3 numbers to work w/ ... We can't determine the moving ball momentum.. Soo[/B]