Three Boys Each Pull with a 20-Lb Force on the Same

Multiple Choice

Three boys each pull with a 20-lb force on the same object, as shown in Figure 3-5.
Figure 3-5

The resultant force will be

A) 20 lb to the left.
B) zero.
C) 20 lb down.
D) 20 lb up.
E) cannot be determined; insufficient information