A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum as shown in Figure 13-1. The pendulum mass is 0.350 kg.

A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum as shown in Figure 13-1. The pendulum mass is 0.350 kg. The ball is caught in the pendulum, and the center of mass of the system rises a vertical distance of 0.145 m in the earth's gravitational field. What was the original speed of the ball? Assume that g ¼ 9.80 m/s 2 . Show your work.