# Homework Help: Spring scale Problem

1. Oct 4, 2009

### DrDanger

1. The problem statement, all variables and given/known data
You use a spring scale to pull a 1.5 kg object on a horizontal frictionless surface with a constant horizontal force of 1.3 N (according to the scale reading). You use a stopwatch to time how long it takes the object, starting from rest, to cover a distance of 2.7 m. What is the reading of the stopwatch?

2. Relevant equations
F=-KX
F=ma
$$\Delta X=VoT+.5aT^2$$

3. The attempt at a solution
So I did a=F/m to get the acceleration then plugged that into $$\Delta$$ X=VoT+.5aT^2 and Vo is equal to 0. After i plugged it all in I got 2.49, is that right? For some reason it seems wrong.

2. Oct 4, 2009

### DrDanger

On a side note, is possible to find k using f=kx?