How Do You Calculate the Initial Speed of a Bullet Using Mass and Height?

[ems1312]

Homework Statement

A bullet of mass m is fired into a large block of wood, mass M, suspended by two long cords. The bullet comes to rest in the block so that the system swings upwards, coming to rest after traveling through a vertical distance h.
Find in terms of m, M, and h:
the initial speed of the bullet.

Homework Equations

The Attempt at a Solution

Do not know where to start.

 

[ideasrule]

Start by using the conservation of momentum to figure out the speed of the block at the bottom of the swing.