The choice of which variable goes on the x-axis (horizontal axis) and which one goes on the y-axis (vertical axis) in a graph depends on the specific context and purpose of the graph.
In general, the convention is to place the independent variable, or the variable you are manipulating or controlling, on the x-axis. The dependent variable, or the variable that is influenced or affected by changes in the independent variable, is usually placed on the y-axis.
In the case of acceleration and total mass, if you are interested in exploring how changes in total mass affect acceleration, you would place total mass on the x-axis and acceleration on the y-axis. This would result in a graph titled "Acceleration vs. Total Mass."
By plotting the data points with total mass values on the x-axis and their corresponding acceleration values on the y-axis, you can visually observe any relationship or pattern between the two variables.