- #1

joker2014

- 21

- 0

## Homework Statement

After a mass weighing 8 pounds is attached to a 5-foot spring, the spring measures 6.6 feet. The entire system is placed in a medium that offers a damping constant of one. Find the equation of motion if the mass is initially released from a point 6 inches below the equilibrium point with a upward velocity of 1 ft/sec.

## Homework Equations

F=kx

my''+cy'+ky=0

## The Attempt at a Solution

I got k=8/(6.6-5) = 8/1.2

c= 1 as given ?

setting up the eqn I got 1/4 y'' + 1y' + 8/1.2 y = 0

or y'' +4y' + 80/3 y = 0

is this actually right? I tried 3 times and I keep getting this, i don't know i feel suspicious ?!