The rotational inertia of a disk about its axis is 0.70 kg·m^2. When a 2.0-kg weight is added to its rim, 0.40 m from the axis, the rotational inertia becomes:   A. 0.38 kg·m^2.   B. 0.54 kg·m^2.   C. 0.70 kg·m^2.   D. 0.86 kg·m^2.   E. 1.0 kg·m^2.

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