Identical particles are placed at the 50-cm and 80-cm marks on a meter stick of negligible mass. This rigid body is then mounted so as to rotate freely about a pivot at the 0-cm mark on the meter stick. If this body is released from rest in a horizontal position, what is the angular speed of the meter stick as it swings through its lowest position?
◦ 4.2 rad/s
◦ 5.4 rad/s
◦ 4.6 rad/s
◦ 5.0 rad/s
◦ 1.7 rad/s