Hello!

I have a problem when calculating the kinetic energy of a group of rigid body. I calculated the total kinetic energy using ke command. And I calculated the translational kinetic energy and the rotational kinetic energy using ke/rigid and erotate/rigid, respectively. However, the total kinetic energy does not equal the sum of the translational kinetic energy and the rotational kinetic energy. The difference between them become larger if the time step is longer. I want to know what causes the difference. I attached a simple case to show the problem more clearly.

Thanks!

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liujh15

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