- #1

- 40

- 0

## Homework Statement

Here is the problem:

http://www.chegg.com/homework-help/questions-and-answers/7-blocks-collide-elastically-frictionless-surface-write-conservation-momentum-relation-thi-q237700

## Homework Equations

There is conservation of momentum involved along with conservation of kinetic energy.

Thus,

m1v1+m2v2=m1v1 final - m2v2 final

## The Attempt at a Solution

When I do all the calculation and solve the quadratic for part c, I come up with a final velocity of -1 for the heavier block. The question I have is that is this a sign error? It would make more sense that the collision would result in the blocks going in the direction that the heavier object was going. Also, I got 3 for the other block (positive).