CONCEPT QUIZ 1. At the instant shown, the spring is undeformed. Determine the change in potential energy if the 20 kg disk (KG = 0.5 m) rolls 2 revolutions without slipping. A) (200) (1.2)² + (20)9.81(1.2π sin 30°) B) (200) (1.2л)² - (20)9.81(1.2π sin 30°) C) (200) (1.2)² - (20)9.81(1.2л sin 30°) D) (200) (1.2)² datum k = 200 N/m wwwwww 2. Determine the kinetic energy of the disk at this instant. A) (12)(20)(3)² B) (20) (0.52)(10)² C) Answer A + Answer B D) None of the above 3 m/s 0.3 m 30°