[SOLVED] Initial Speed formula 1. The problem statement, all variables and given/known data 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. Relevant 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.