# Homework Help: Is this a conservation of energy problem?

1. Dec 4, 2017

### Lori

1. The problem statement, all variables and given/known data

I'm sorry but I don't have the exactly problem written down but I know the givens.

So the question involves finding work done on a pendulum hanging from the ceiling.

2. Relevant equations
I was given the the length of the string is 1m. That a mass hangs at the bottom of string and it's 2kg. That it displaces .5 meters to the left.

3. The attempt at a solution
I was thinking that I had to do mgh = 1/2mv^2 but then did know how to get velocity.

Any clues?

2. Dec 5, 2017

### Staff: Mentor

Velocity of what?

Did you draw a sketch? What is the height of the mass at the end (and initially)?

3. Dec 5, 2017

### Lori

Yes I've done the sketch. There was no given height!! That's why I'm kinda a bit lost and confused.

4. Dec 5, 2017

### Abhishek kumar

Velocity
But you have given mass displaced.5 meter and lenght of string 1meter from this you can calculate height

5. Dec 5, 2017

### Lori

I'm not really recognizing how we can find height?

6. Dec 5, 2017

### barryj

I don't think you have done the sketch properly. Draw the sketch and dimension where the mass is located.

7. Dec 5, 2017

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8. Dec 5, 2017

### Abhishek kumar

You show the figure i have posted?