# Cart rolling on table

1. Jun 21, 2009

### Walid11

1. The problem statement, all variables and given/known data
125N of force are required to compress a spring by 1.04m. The cart rolls across the table at a constant speed. It then rolls up an inclined board and comes to rest. How high above the table is the cart when it stops?

2. Relevant equations

3. The attempt at a solution

2. Jun 21, 2009

### rock.freak667

Re: ??

??

Conservation of energy might aid you here.

3. Jun 21, 2009

### bucher

There's not enough information to make any calculations. But from what I can tell from the problem, it's just the conservation of spring energy to potential energy.

4. Jun 21, 2009

### Walid11

well it moves at 9.3 m/s horizontally

5. Jun 21, 2009

### bucher

Then it's conservation of Kinetic Energy to Potential ....

6. Jun 21, 2009

### Walid11

what's the formula for that?

7. Jun 21, 2009

### ideasrule

Well, kinetic energy is (1/2)mv^2 and potential energy is (1/2)kx^2. Have you seen these equations before?

8. Jun 21, 2009

### rock.freak667

Uhm I assume the spring-cart system is initially at rest. So then you want all the potential energy of the spring to be converted into gravitational pe (mgh). You need to get h.

9. Jun 21, 2009

### Walid11

yeah, i just couldn't differentiate. Thank you

10. Jun 21, 2009

### ideasrule

Oops, I didn't read the question and assumed the potential energy bucher was talking about was spring potential energy. Apologies!