A block of wood is suspended at rest; the mass of the block is 3.25 kg. A bullet was fired at the block; the mass of the bullet 20 grams.

A block of wood is suspended at rest; the mass of the block is 3.25 kg. A bullet was fired at the block; the mass of the bullet 20 grams. the bullet remains in the block and both swing to a max height of 0.850 m above the initial position. What it the initial velocity of the bullet?