- #1

Olijet

- 2

- 0

## Homework Statement

A mass of 20kg is suspended at a high of 5 meters above the ground. It is on the moon (then acceleration = 1.635 m/s

^{s}). It falls, and we want to know the total energy halfway, at 2.5 meters above the ground.

## Homework Equations

I suppose the equations I need to use are kinetic and potential energies :

Ek = 1/2.m.v

^{2}

Ep = m.g.h

## The Attempt at a Solution

Once I have the values for Ek and Ep, can I proceed like this : E

_{total}= Ek + Ep ?

I have seen on many physics books that without friction, the E

_{t}is constant. But what means that constant ? Is there any numeric values ? What do I have to answer at the question : what is the E

_{total}?

Thank you very much for your help,

Olijet