The Graph is on youtube on this site:
http://www.youtube.com/watch?v=X2Ciu87HnlQ
http://www.youtube.com/watch?v=X2Ciu87HnlQ
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It's a graph of velocity vs. time, so acceleration is the slope, and if you really wanted the acceleration function is the derivative of that graph. The minimum acceleration is zero, at that instant at the 4 second mark when the graph is neither going up nor down.
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The graph has no acceleration, unless you print it out and take it for a ride.
The graph is of velocity versus time, So the acceleration is the slope of the curve. the minimum slope and therefore the minimum acceleration is at t=4 second.
The graph is of velocity versus time, So the acceleration is the slope of the curve. the minimum slope and therefore the minimum acceleration is at t=4 second.