From 35dbdeb9cc03d9f912cee00b2dccea4182c531cf Mon Sep 17 00:00:00 2001
From: "Ryan C. Cooper" <ryan.c.cooper@uconn.edu>
Date: Wed, 22 Feb 2017 11:42:29 -0500
Subject: [PATCH] add spring constant

---
 HW4/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/HW4/README.md b/HW4/README.md
index 0b8a5f8..7f04a9a 100644
--- a/HW4/README.md
+++ b/HW4/README.md
@@ -21,7 +21,7 @@ heading `# Homework #4` in your `README.md` file
 
     PE_s=1/2\*K \*(DL)^2
 
-    where DL = 0.5 - sqrt(0.5^2+(0.5-x_C)^2)
+    where DL = 0.5 - sqrt(0.5^2+(0.5-x_C)^2) and K=30 N/m.
 
     b. Use the `goldmin.m` function to solve for the minimum potential energy at xc when
     theta=0. *create an anonymous function with `@(x) collar_potential_energy(x,theta)` in