Kinematics, Position time Graph.

AI Thread Summary
To determine the velocity at a specific time on a position-time graph that does not start at zero, one can either use the slope of the tangent line at that point or calculate the average velocity between two points. The discussion centers around a position-time graph where the x-axis represents time in hours and the y-axis represents position in kilometers, with the curve accelerating and then stopping at one hour. A specific example involves finding the velocity at 0.1 hours, which is given as 5.0 km/h, and then calculating the average velocity for the first 0.5 hours. Clarification on the graph's shape and a request for a diagram were made to better visualize the curve. Understanding the graph's characteristics is essential for accurate velocity calculations.
pdot
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finding the velocity of a time that does not start at 0. i have the answer but i do not know how to do it. do i use a tangent or go from point one to point two? sorry for being the least bit descriptive, I'm not a genius.
 
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pdot said:
finding the velocity of a time that does not start at 0. i have the answer but i do not know how to do it. do i use a tangent or go from point one to point two? sorry for being the least bit descriptive, I'm not a genius.

You'll have to be the least bit more descriptive. :smile:

Can you give a specific example of what you mean?
 
i have a position time graph, going from 0 - 1.0. going up by .1 each centimetre on my metric graph paper. at first i am asked to find how fast the object is moving at .1 hours. the answer is 5.0km/h. i understood that, but then i am asked to find how fast it was for the first .5h . with this being said, i will tell you i am a tenth grade student taking physics 11.
 
So, to clarify, you have a position versus time graph. The x-axis is time, and its scale goes from 0 hours to 1 hour. The y-axis is position, and it goes from what to what? what are the units?

Now, the curve. Is it a straight line? Does it pass though the origin or does it have x or y intercepts?
 
the units are position ( km ) and time ( h ) . the curve accelerates and then stops at one hour. i would like to say sorry, as i am not as smart as you. you seem very intelligent.
 
I'm afraid that so far I can't quite picture the curve from the description so far. "The curve accelerates" could have many interpretations. Does it follow a parabolic curve during the acceleration?

Would it be possible for you to include a diagram?
 
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