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Correct answer is B
41 A puck with a mass 80.0 g and a radius of 4.00 cm slides along an air table at a speed of 1.50 m/s, as shown in the Figure P11.38a. 1.50 m/s (b) It marks a glancing collision with a second puck having a radius of 6.00 cm and a mass of 120 g (initially at rest such that their rims just touch.) Because their rims are coated with an instant acting glue, the pucks stick together and spin after the collision (Figure P11.38b) (a) What is the angular momentum of the system relative to the center of mass? (b) What fraction of the original kinetic energy is lost in the collision. (a) 4.80 x 104 gcm2/s; (b) 78.7% a. b. (a) 7.20 x 104 gcm²/s; (b) 6.21% C. (a) 7.20 x 104 gcm²/s; (b) 37.9% d. (a) 4.80 x 104 gcm²/s; (b) 21.3% correct: b