This might do better in Tilted Knowledge, but whatever.
I really don't remember that much about physics, but I'd think that part B would be exactly the same except that your v0 (v-nought or v-initial, however you notate it) would be 4.00 m/s. The same acceleration would apply, etc.
Actually, working a couple of steps back from your final answer, you made an algebra mistake. When you went from 59.2 + 1/2... to 118.4... you didn't distribute the times two correctly. For your last line you should have had 118.4036 + 16 = Vf^2
Answer? 11.5932