4. The pendulum has 10 lb slender rod AB and 8 lb block. A projectile weighs 0.5 lb is fired into the center of the block with a velocity of 500 ft/sec. If the pendulum is initally at rest and the projectile embeds into the block, determine the angular velocity of the pendulum right after the impact. (10 points) (Show FBD and Kinetic diagram). A m. 3 13 500ft/Sc 2' B List of equations: 2' KI