3. A small round ball is attached to the ceiling with a thin stick. The ball has mass m and the stick has length L (from the point where it touches the ceiling to the center of the ball). You can ignore the mass of the stick. A You pull the ball to the side so that the string makes an angle of A with the ceiling as shown in the image. L Derive the equation for the angular acceleration felt by the mass at the moment you let go of the ball and let it swing down (its angle is still A) . Your equation should involve only variables defined in the problem, m numbers, and physical constants if needed. Describe the physics of your derivation. Do not just list equations. [10 pts]