Spring constant and energy with 500g mass stretched 8.0 cm

[Ereny]

Homework Statement

a spring stretches 8.0 cm when a 500. grams mass is hung from it.

a. determine the spring constant.the mass is originally pulled 10.0 cm from equilibrium position. calculate the total energy in the system, and the EPE and KE if the distance is 4.0 cm from the equilibrium ?

The Attempt at a Solution

i figured that out and its k= 61.9N/m

i figured the total energy which is .307J but i can't figure out KE and EPE

i really need help guys

 

[rock.freak667]

The Attempt at a Solution

i figured that out and its k= 61.9N/m

i figured the total energy which is .307J but i can't figure out KE and EPE

i really need help guys

Remember that energy is conserved throughout the entire motion. So the total will remain constant throughout.

At any point during the motion, the PE+KE = Total Energy.

Can you get the PE when the mass is 4.0 cm from the equilibrium position?

 

[Ereny]

Kk thanks I figured it out!