- #1

Mathieu

- 8

- 0

## Homework Statement

A spring of constant 18 N/cm is compressed a distance 7cm by a 0.5 kg mass, then released. It skids over a frictional surface of length 1.6m with coefficient of friction 0.17, then compresses the second spring of constant 5 N/cm. the acceleration of gravity is 9.8m/s^2

## Homework Equations

PE=1/2kx^2 --- potential energy = 1/2 kinetic length ^2

KE=1/2mv^2 --- kinetic energy = 1/2 mass velocity ^2

W=Fd ---work = force distance

## The Attempt at a Solution

i converted all the cm to m.. then plugged them into EP=1/2kx^2.. so

PE=1/2(.18)(0.07)^2

PE=0.000441J

but this already didn't look right, however, I still used it in W=Fd.

W = 0.000441*1.6

W = 0.000705600

now this REALLY isn't looking right, and I really have NO idea what I'm doing, except getting random numbers. As much as I love physics (really, I use to want to be a physicist) i have never really understood what I'm doing as far as these harder problems go. If anyone could help me, that would be amazing. thanks!

Mathieu