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The M.I. of a uniform disc about an axis...

The M.I. of a uniform disc about an axis passing through its centre and perpendicular to its plane is `1kgm^(2)`. It is rotating with an angular velocity to `100rads^(-1)`. A second disc of same mass and radius is joined to it coaxially. Now these two discs together continue to rotate about the same axis. Then the lose in kinetic energy in kilo joules is

A

`2.5`

B

`3`

C

`3.5`

D

`4`

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The correct Answer is:
A
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