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27 May, 08:57

An object moves along the x axis according to the equation x = 3.00t^2 - 2.00t + 3.00 where x is in meters and t is in seconds.

Determine the average speed between t = 2.00 s and t = 3.00s

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  1. 27 May, 09:08
    0
    x = 3 t² - 2 t + 3

    When t=2 sec, x = 3 (4) - 2 (2) + 3

    = 12 - 4 + 3 = 11 meters.

    When t=3 sec, x = 3 (9) - 2 (3) + 3

    = 27 - 6 + 3 = 24 meters.

    Distance = (end position) - (start position) = (24m - 11m) = 13 meters

    Time = (end time) - (start time) = (3s - 2s) = 1 second

    Speed = (distance) / (time) = 13 meters / 1 sec = 13 meters/second
  2. 27 May, 09:10
    0
    We are given the equation:

    x = 3 t² - 2 t + 3

    We use that equation to calculate for the distance traveled.

    At t=2 sec, x = 3 (4) - 2 (2) + 3

    x = 11 meters

    At t=3 sec, x = 3 (9) - 2 (3) + 3

    x = 24 meters

    Velocity = (24 meters - 11 meters) / (3 s - 2 s) = 13 m/s
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