The length a spring stretches is directly proportional to the force applied. If a force of x pounds stretches a spring h inches, how much force is necessary to stretch the same spring m inches? (Assume x = 7, h = 4, and m = 15.)

Answer 1

7/4 as f/15 therefore 4 times 3.75 = 15
then 7 times 3.75 = 26.25

Answer: 26.25 is the force needed to stretch 15 inches which is m.