Question

Three balls are attached to a cable and are being rotated. Ball (A) is 0.5 kg and is 1.0 meter away from the axis of rotation. Ball (B) is 1.0 kg and placed 0.8 meter away from the axis. Ball (C) which is 0.5 meter away from axis.

Answer 1

Moment of inertia of the system

$I=0.5\cdot1^2+1\cdot0.8^2+1.2\cdot0.5^2=1.44\ (kg\cdot m^2)$