A uniform meter stick is supported by a knife edge at the 50 cm mark and has a masse of 2.1 kg hanging from the 8 cm mark. A second mass of 8.

A uniform meter stick is supported by a knife edge at the 50 cm mark and has a masse of 2.1 kg hanging from the 8 cm mark. A second mass of 8.6 kg should be hung at the _____ cm mark to keep the stick balanced?