# Answer confirmation-not an assignment question.

1. Oct 13, 2012

Hi! I have attached the picture. Can someone please tell me what equation of motion will be?
My guess is that it will be

$\ddot{x}$ = -k/x -kx/2

#### Attached Files:

• ###### spring.png
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2. Oct 13, 2012

### Staff: Mentor

What is x? What is "O"? What is fixed, what is not?
Those things labelled "k" are springs?

3. Oct 13, 2012

### Staff: Mentor

Note that the springs are pulling in opposite directions. Check your signs.

4. Oct 13, 2012

### Staff: Mentor

I think the signs are right, but it depends on the (unknown) original problem. However, an x in the denominator looks odd and I would expect to see a mass in the equation.