If a body starts rotating from rest due ...

If a body starts rotating from rest due to a torque of 1.5 Nm, then its kinetic energy after it complete 20 revolution will be

`60 pi J`

`30 pi J`

`70 pi J`

`90 pi J`

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Verified by Experts

The correct Answer is:

`KE = tau theta`
`theta = 20xx255 = 2xx40 pi = 80 pi J`

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