How can you determine instantaneous velocity from a position-time graph?

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SUMMARY

Instantaneous velocity can be determined from a position-time graph by calculating the derivative of position with respect to time, represented mathematically as v = dx/dt. This derivative corresponds to the slope of the curve at any given point on the graph. If the curve's slope is not immediately clear, one can approximate the instantaneous velocity by drawing a secant line to estimate the slope.

PREREQUISITES
  • Understanding of calculus, specifically derivatives
  • Familiarity with position-time graphs
  • Knowledge of slope and its significance in graph interpretation
  • Basic skills in drawing and analyzing secant lines
NEXT STEPS
  • Study the concept of derivatives in calculus
  • Learn how to interpret position-time graphs in detail
  • Explore techniques for drawing and using secant lines
  • Investigate applications of instantaneous velocity in physics
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Students studying physics, educators teaching calculus, and anyone interested in understanding motion analysis through graphical representations.

chiwen1
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How would you find the instantaneous velocity if only given a position-time graph?
 
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Welcome to PF chiwen1!

The definition of instantaneous velocity is the derivative of position with respect to time:

v = dx/dt

So, on a position-time graph, this corresponds to the slope of the curve at any point.
 
BTW, if that isn't obvious then you will have to make a secant line approx.
 

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