# a force of 250 N is required to stretch a spring 5 m from rest. Using Hooke's law

• March 26th 2010, 06:22 PM
yoman360
a force of 250 N is required to stretch a spring 5 m from rest. Using Hooke's law
a force of 250 N is required to stretch a spring 5 m from rest. Using Hooke's law, F=kx, how much work, in Joules, is required to stretch the spring 7 m from rest?
• March 26th 2010, 06:30 PM
skeeter
Quote:

Originally Posted by yoman360
a force of 250 N is required to stretch a spring 5 m from rest. Using Hooke's law, F=kx, how much work, in Joules, is required to stretch the spring 7 m from rest?

use Hooke's law to solve for k, then determine work done on the spring ...

$W = \int_0^7 kx \, dx$