# Elastic collisions in one dimension, unequal masses target at rest

#### vinnyzwrx

1. Homework Statement

Derive formula for elastic collisions in one dimension, unequal masses target at rest.

i am having trouble acquiring the same formula that the book gives me, please tell me where my algebra is incorrect...

i need to be able to derive these formulas properly because in future problems i need to solve for different variables depending on the given data.

heres my work...

[URL]https://tdsal.homeserver.com/photos/photos%20hosted%20on%20internet/img_1457.jpg[/URL]

this is the correct formula, that i cant seem to get too.

[URL]https://tdsal.homeserver.com/photos/photos%20hosted%20on%20internet/img_1459.jpg[/URL]

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