41. A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with an angular velocity of 20 rad/s. Its kinetic energy is
(a) 10 J
(b) 100 J
(c) 500 J
(d) 250 J
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a