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23 February, 20:59

A car traveling at 39 m/s starts to decelerate steadily. It comes to a complete stop in 9 seconds. What is its acceleration?

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Answers (2)
  1. 23 February, 21:02
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    Acceleration = (final velocity-initial v.) / time

    = (0-39) / 9

    = - 4.33m/s^2
  2. 23 February, 21:28
    0
    Acceleration = (change in speed) / (time for the change)

    Change in speed = (end speed) - (start speed) = (zero - 39 m/s) = - 39 m/s

    time for the change = 9 seconds

    Acceleration = (-39 m/s) / (9 seconds)

    Acceleration = - 4.33 m/s²
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