A 2.90 kg box rests on a horizontal, frictionless surface. A light string is attached to the box that runs through a massless and frictionless pulley to suspend a box of mass m with its other end. The boxes are released and the tension in the string is found to be 9.80 N. Draw one free-body diagram for each box.

• A.
• B.
• C.
• D.
• E.

Answer: (C)