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A rod with a length of 80 cm is pivoted about a horizontal axis through its...

A rod with a length of 80 cm is pivoted about a horizontal axis through its center (rod's mass is negligable). A black mouse with a mass of  0.510 kg clings to one end of the stick, and a brown rat with a mass of  0.211 kg clings to the other end. The system is released from rest with the rod horizontal.

Part A

If black mouse and brown rat can hold on, Find their velocities as the rod swings through a vertical position?
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