Finding initial bullet velocity in collision with 7kg block

[Imbadatphysics]

Homework Statement

Im stuck on this question please help. =/
a 50.0g bullet travels right and becomes embedded in a 7.00kg stationary block. the block and embedded bullet moves off at a velocity of 5.00m/s right. what was the initial velocity of the bullet? the answer is 706m/s right.

Homework Equations

The Attempt at a Solution

 

[TSny]

Watch your units. Try including units when you set up your equation.

 

[Imbadatphysics]

ohh i see so instead of 50g i convert it to 0.05kg i got 710m/s its still 4m/s off?

 

[Imbadatphysics]

nvm I am bad sorry for wasting ur time gg it was 35.25 instead of 35