# Maximum speed for pendulum problem

1. Jan 21, 2007

### soulja101

1. The problem statement, all variables and given/known data
A pendulum of length 1.0cm is raised 15cm. What is the maxium speed it can reach the bottom.

2. Relevant equations
I have no clue. All i know is that v1 is zero.

3. The attempt at a solution
i need help to get started

2. Jan 21, 2007

### Integral

Staff Emeritus
I am having trouble understanding the situation. How do you raise a 1cm pendulum 15cm? Please check your post for typos.. could it be a 1m pendulum?

3. Jan 21, 2007

### soulja101

pendulum

the pendulum length is 1.0m

4. Jan 21, 2007

### DieCommie

Maybe conservation of energy? Kinetic and potential?

5. Jan 21, 2007

### Ja4Coltrane

energy is correct. good.
So because of the way they wrote the queston, it's very easy.
:)

6. Jan 21, 2007

### Kurdt

Staff Emeritus
At equilibrium (i.e. the bottom in this question), all the potential energy has been converted to kinetic energy.

7. Jan 21, 2007

### soulja101

do i use the Ek=mv2

8. Jan 22, 2007

### Kurdt

Staff Emeritus
That is not the kinetic energy equation. $$E = \frac{1}{2} mv^2$$