graphs of the position functions are shwon...

http://img15.imageshack.us/img15/454...00125at105.png

Im not sure how to do this. Dont mind some of the numbers in there they are just guesses. I would think it would speeding down when the red line is going toward negative and speeding up when its going positive but i guess not :( Any ideas?

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Originally Posted by Evan.Kimia

http://img15.imageshack.us/img15/454...00125at105.png

Im not sure how to do this. Dont mind some of the numbers in there they are just guesses. I would think it would speeding down when the red line is going toward negative and speeding up when its going positive but i guess not :( Any ideas?

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It think "up" is the key word here, isn't it?

Quote:

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Originally Posted by Evan.Kimia

http://img15.imageshack.us/img15/454...00125at105.png

Im not sure how to do this. Dont mind some of the numbers in there they are just guesses. I would think it would speeding down when the red line is going toward negative and speeding up when its going positive but i guess not :( Any ideas?

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suppose that you need to draw the curve's tangent line and track the varying trend of the tangent slope k. then the particle is speeding up if its absolute value |k| is increasing, or the particle is slowing down.
This is because |k| relates to |delta S|/|delta t|, i.e., velocity.