(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

"If the work required to stretch a spring 3 ft beyond its natural length is 8 ft-lb, how much work W is needed to stretch it 9 in. beyond its natural length?"

2. Relevant equations

F=kx.

3. The attempt at a solution

F=kx so 8 = 3k. k= 8/3 then I use an integral of from 0 to .25 (9 inches is .25 of three feet) of (8/3)x. I do it manually and get 1/12. I'm wrong so I do it on a calculator to check for error and I get the same answer. I must be approaching the problem incorrectly, but how?

Thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Problem of Springs

**Physics Forums | Science Articles, Homework Help, Discussion**