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**1. Homework Statement**

A 0.10-kg object moving initially with a velocity of 0.20 m/s eastward makes an elastic head-on collision with a 0.15-kg object initially at rest. What is the final velocity of the .10 kg object after the collision ?

**2. Homework Equations**

im not sure which equation to use :/

**3. The Attempt at a Solution**

i tried using m1v1+m2v2=(m1+m2) V

but it didnt come out right.

and i know the answer is -0.045 m/s