The Distance (D) That a Spring Will Stretch Varies Directly

Multiple Choice

The distance (d) that a spring will stretch varies directly as the force (f) applied to the spring. If a force of 4 lb is required to stretch a spring 2 in., what force is required to stretch the spring 6 in.?

A) 1 lb
B) 3 lb
C) 12 lb
D) 15 lb
E) 13 lb