# graphs of the position functions are shwon...

• Jan 25th 2010, 07:03 AM
Evan.Kimia
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?
• Jan 25th 2010, 07:15 AM
VonNemo19
Quote:

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?

It think "up" is the key word here, isn't it?
• Jan 25th 2010, 07:36 AM
kylehk
Quote:

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?

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.