# Compressed vertical spring

1. May 23, 2005

### bullroar_86

if a vertical spring is being compressed down, is the Elastic potential energy the only energy?

Ee = .5kx^2

is gravity included in that? or does it not play a role?

and how could I tell how far an object would fly up in the air once the spring is released?

thanks

2. May 23, 2005

### whozum

Thats the energy with regards to the spring's compression.
The spring's potential energy will be translated to kinetic energy, how does gravity affect this energy/

3. May 23, 2005

### bullroar_86

well i know that the force of gravity will work against the kinetic energy...

I have an elastic potential energy of .2 J, so the kinetic energy will also be .2 J (up) ..

I know the mass of the item, and g, so I know that

Fg = mg

just not sure how to put the two together and get a height out of it.

4. May 23, 2005

### whozum

express the gravitation in terms of energy, the .2J would result in a change of gravitational potential energy.

5. May 23, 2005

### bullroar_86

ahh ok so,

.2J = mgh

and

h = .2J/mg

6. May 23, 2005

### bullroar_86

well i'm still a little confused, the equation E = mgh is still a potential energy equation, not the kinetic energy equation (E = .5mv^2)

is the above solution correct? (previous post)

7. May 23, 2005