CBSE BOARD X, asked by kiran89194, 9 months ago

What is the value of new KE?

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Answered by N1ck

2

Answer:

1.increases by 30J

Explanation:

angular momentum is conserved

thus, Iw=I'w'

Iw=0.8Iw'

w/0.8=w'

New KE= 1/2I'(w') ²

KE'=150J

Thus kinetic energy of the boy increases by 30 J

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