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Angular momentum of body changes by 80 k...

Angular momentum of body changes by 80 kg `m^(2)//s`, when its angular velocity changes from 20 rad/s to rad/s. Then the change in its kinetic energy is

A

1200 J

B

1800 J

C

1600 J

D

2400 J

Text Solution

Verified by Experts

The correct Answer is:
D
`L_(2)-L_(1)=I(omega_(2)-omega_(1))`
`KE_(2)-KE_(1)=(1)/(2)I(omega_(2)^(2)-omega_(1)^(2))`
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