88. In a playground there is a merry-go-round of mass 120 kg and radius 4 m. The radius of gyration is 3m. A child of mass 30 kg runs at a speed of 5 m/sec tangent to the rim of the merry-go-round when it is at rest and then jumps on it. Neglect friction and find the angular velocity of the merry-go-round and child
(a) 0.2 rad/sec
(b) 0.1 rad/sec
(c) 0.4 rad/sec
(d) 0.8 rad/sec
Ans. c
(91)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)