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A small blob of putty of mass m=12 g falls from the ceiling and lands on the outer rim of a turntable of radius R= 20 cm and moment of inertia I0= 5 kg.m2 that is rotating freely with angular speed ?0 = 100 rev/s about its vertical fixed-symmetry axis. What is the post-collision angular speed of the turntable-putty system?

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