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    tha f0rc3's Avatar
    tha f0rc3 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 12, 2009, 10:36 PM
    Instantaneous velocity in position time graph
    Time t(s) Position d(m [N] of Start)

    0
    1.3
    5.2
    11.7
    20.8
    32.5
    46.8
    0
    1
    2
    3
    4
    5
    6
    this is the table sorry if its so un organized

    I need to know the instant velocity at t=0,1,2,3,4 and 5 seconds
    thanks for the help
    and show me exactly what formulas u used show your worlk plzz
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
     
    #2

    Sep 14, 2009, 06:53 AM

    Assuming constant acceleratrion (which does indeed seem to be the case here), the formula for an object's position starting with zero initial velocity is:

    d = 1/2 a t^2.

    Given the values for t and d in your chart you can determine the value for a (acceleration). Then to determine the velocity at any point in time use the formula

    v = at.

    Hope this helps.

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