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Determining instantaneous velocity and average velocity using a graph. 
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#1
Jul2109, 04:15 PM

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The position of a rabbit along a straight tunnel as a function of time is plotted in Fig. 226.
Here's the figure: http://www.webassign.net/giancoli5/2_26.gif Determine its instantaneous velocity at the following times. (a) t = 5.0 s (b) t = 30.0 s Determine its average velocity between the following times. (c) t = 0 and t = 5.0 s (d) t = 25.0 s and t = 30.0 s (e) t = 45.0 s and t = 50.0 s a) I tried to find the slope of the straight line through [0,20] seconds by taking two points in it and take delta x / delta t b) I drrew a tangent line to the curve at t = 30 then find its slope. For c , d , & e the avg v is: (Xfinal  Xinitial)/(t final  t initial) but still, I could not find an answer for any of them. It seems as if nothing is working. 


#2
Jul2109, 04:30 PM

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P: 26,148

Hi Crescent! Welcome to PF!
Show us what you've tried, and where you're stuck, and then we'll know how to help! 


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