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How do you find instantaneous speed using a velocity vs time graph? 

off-topic
 Oct 3, 2019
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Well presumably the velocity vs. time graph is actually a group of graphs, one for each directional component of the velocity vector.

 

Simply look up the value for each component on the graph at the time you want the speed,

 

then take the square root of the sum of the square of each directional component.

 

That will be the instantaneous speed.

 Oct 3, 2019

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