How to do error analysis in this lab on linear motion

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To perform error analysis for the linear motion lab, start by identifying the uncertainties in the measurements of the glider's mass and the spacer's thickness. Use the given uncertainties to calculate the propagated error for any derived quantities, such as acceleration or force, based on the equations used in the experiment. Analyze the graph from LoggerPro by determining the slope and intercept, and apply uncertainty calculations to these values. It’s important to clearly document each step of the calculation process to ensure accuracy. Completing these steps will provide a comprehensive error analysis for the lab.
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Okay so I did a lab on Linear Motion using the glider with the air track and a spacer. This is the information I have about the glider and spacer.

glider mass = (468.7 +/- 0.02) g
thickness of spacer =(14.8 +/-0.05) mm

I'm stuck on doing the error analysis and I don't know how to go on about analyzing the graph then finding the uncertainties. Here's the graph that I printed out from LoggerPro.
 

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anyone? i really need this, I've completed everything else but the complete calculations for analysis and data, i just need an idea on how to approach the calculations. I'm getting confused looking at the computational guide for uncertainties =(
 

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