Help determining initial velocity

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To determine the initial velocity of gliders on an airtrack, the key data recorded includes a change in position (x) of 0.3 meters and a time (t) of 1.1 seconds. The initial velocity can be calculated using the formula for average velocity, which is the change in position divided by the time taken. The slope of the x-t graph represents the velocity of the glider. Therefore, the initial velocity can be found by dividing 0.3 meters by 1.1 seconds, yielding approximately 0.273 meters per second.
valdez237
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im working on a lab and i have to determine the initial velocity of gliders that we pushed down an airtrack. the only data that was recorded is the change in x and time.

eg.
change in x = .3 meters
t= 1.1 seconds


i've looked through all the equations i could think of to find the answer to this, but they all require more than one variable. if i could even get the slightest bit of help that would be amazing.
 
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Which quantity is represented by the slop of x-t graph?
 

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