Suppose the pendulum bob in (Figure 1) has a mass of 0.23 kg and is moving to the right at point B with a speed of 2.4 m/s . Air resistance is negligible.The string is 1.2 m long, and the inical angle is 35*.

Part A: What is the change in the system's gravitational potential energy when the bob reaches point A?
Part B: What is the speed of the bob at point A?