74. A disc is rotating with an angular speed of ω. If a child sits on it, which of the following is conserved
(a) Kinetic energy
(b) Potential energy
(c) Linear momentum
(d) Angular momentum
Ans. d
(11)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)