# Finding PE given mass, distance, and energy lost.

## Homework Statement

I'm supposed to find the potential energy at the start of a system for a vehicle given that the mass is 4000kg, the total distance traveled is 800m, and 3/4 of the total energy is lost to heat and friction by the end of the distance traveled (it's assumed that the vehicle starts from rest). Now, I know I can easily solve for a variable, but given this information I'm under the impression that I need to get a numerical answer. It's frustrating because I feel like I am not taking something into account.

PE = mgh

## The Attempt at a Solution

I've come up with really just substitution for the variables, so:
PE = 4500kg*9.8m/s^2*h.

jbriggs444
Homework Helper
Is that all of the information that you have been given? It's not enough.

Is that all of the information that you have been given? It's not enough.
Unfortunately, yes. I have scoured over my worksheet - nothing. I've since emailed my professor, but any further input you guys have would be appreciated.

jbriggs444