A Meter Stick Is Supported by a Knife-Edge at the 50-Cm

Multiple Choice

A meter stick is supported by a knife-edge at the 50-cm mark.Doug hangs masses of 0.40 and 0.60 kg from the 20-cm and 80-cm marks,respectively.Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?

A) 20 cm
B) 70 cm
C) 30 cm
D) 25 cm