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Physics: Post your doubts here!

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princess Anu said:
For the velocity time graph, how do I get the average speed for the entire set of data? It starts at the origin, then goes up to (120,25) for A, and then the final point is F which is (720, -140)
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Average speed is total distance travelled / total time.
If the velocity is always zero or greater then average velocity is the same value.

If the velocity drops below zero then you need to add a couple of steps.

Divide the motion into the four regions.
1. acceleration
2. constant
3 negative acceleration
4. positive acceleration

For each of these regions find two things a) the time spent in the region and b) the average velocity (= (V2 + V1)/2 )


Multiply the time by the average velocity for each section.

Add the four answers to get the total distance

Divide by the total time.

If there is any region where the velocity is negative you would need to treat each of those sections as yet more pieces. In those pieces the DISTANCE is positive and is added on prior to calculating average speed.
 
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