Velocity-Time Graph: Positive & Negative

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Homework Statement
Why velocity in graph 1 is positive and in graph 2 is negative?
Relevant Equations
a=dv/dt
IMG_20190803_110107.png

Why velocity in graph 1 is positive and in graph 2 is negative?
 
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Who says it's negative on graph 2?
 
Could it be that you intended to ask about acceleration?
 
sojsail said:
Could it be that you intended to ask about acceleration?
I don't think so. The acceleration is negative in all three plots.
 

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