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## Homework Statement

Part 1 (static method): We measured the displacement of a spring (in cm) after adding and subtracting masses (in g). The spring was placed in a vertical position. I am supposed to find the spring constant k

_{s}.

Part 2 (dynamic method): We did something similar to the above, but we lifted the spring a bit so it would bounce. We then counted the number of oscillations of the spring for 20 seconds each time we changed the masses put on the spring. I am then supposed to find k

_{d}.

## Homework Equations

Hooke's law: F = kx

units of k = N/m (kg/s

^{2})

k

_{s}= Sg

## The Attempt at a Solution

I created a graph and found S + ΔS = 25.3 ± 0.10 g/cm

However, it's the equation k

_{s}= Sg that's messing me up. My instructions don't tell me what I'm supposed to do with g. I have no idea why it's stuck in there. According to this equation, k

_{s}± Δk

_{s}= 25.3 ± 0.10 g

^{2}/cm, but that doesn't seem to make any sense. How am I supposed to end up with the units of kg/s

^{2}when I won't have any of those units until part 2? And if these are

*not*the units I'm supposed to use, how do I know if I do have the correct units?