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The rotational inertia of a disc about i...

The rotational inertia of a disc about its axis is 0.70 kg `m^2`. When a 2.0 kg mass is added to its rim, 0.40 m from the axis, the rotational inertia becomes

A

0.54 kg `m^2`

B

0.80 kg `m^2`

C

1.02 kg `m^2`

D

2.02 kg `m^2`

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