A 12.9 g bullet is fired vertically into a 4.72 kg block of wood. The bullet gets stuck in the block and the impact lifts the block 0.13 m up (That is, the block with the bullet stuck in it rises 0.13 m above its initial position; and then falls back down). Given g = 9.8 m/s², what was the initial velocity of the bullet? Answer in units of m/s.