A puck of mass 80.0 g and radius 4.20 cm slides along an air table at a speed of 1.50 m/s. It makes a glancing collision with a second puck of radius 6.00 cm and mass 140.0 g (initially at rest) such that their rims just touch. Because their rims are coated with instant-acting glue, the pucks stick together and spin after the collision. How do i find the angular momentum of the system relative to the centre of the mass? I have found the centre of mass already. It's 10.7cm from the perimeter of the small puck.