The length a spring stretches is directly proportional to the force applied. If a force of 8 pounds stretches a spring 10 inches, how much force is necessary to stretch the same spring 9 inches?

Answer 1

x = kF
x/F is constant. You want F such that

9/F = 10/8

Answer 2

10

Answer 3

The length a spring stretches is directly proportional to the force applied. If a force of
2
pounds stretches a spring
4
inches, how much force is necessary to stretch the same spring
3
Inches?