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**1. Homework Statement**

A car moving with an initial speed v collides with a second lighter stationary car that is 58.3% as massive. After the collision, the two cars stick together and move off in the same direction as before. Calculate the final speed of the two cars after the collision. Give your answer in units of the initial speed (i.e. as a fraction of v).

**2. Homework Equations**

M1V1+M2V2=M1Vf1+M2Vf2

**3. The Attempt at a Solution**

M1V1=M1Vf+53.8%M1Vf

I ended up with V/.538=Vf but it says im wrong, any1 know what im doing wrong?