An 700 ounce object is attached to a 500 ounce object by a strong thread. They hang together over a pulley as shown below. The 700 ounce object descends 6 inches (the 500 ounce object thereby ascending 6 inches). What is the change in the altitude of the E center for gravity? Take up to be positive and down negative

An 700 ounce object is attached to a 500 ounce object by a strong thread. They hang together over a pulley as shown below. The 700 ounce object descends 6 inches (the 500 ounce object thereby ascending 6 inches). What is the change in the altitude of the E center for gravity? Take up to be positive and down negative