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**[SOLVED] Initial Speed formula**

**1. Homework Statement**

A bullet of mass m = 0.01 kg is fired into a ballistic pendulum of mass M = 2.0 kg as shown in Figure 1. The bullet remains in the block after the collision and the whole system rises to a maximum height of h = 8 cm. What is the bullet’s initial speed?

**2. Homework Equations**

I'm really stumped with what equation to apply to this problem. I want to work it out on my own but I just need help with the what equation to apply.

**3. The Attempt at a Solution**

I've tried the formulas for initial speed.