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13 February, 05:00

A car traveling west in a straight line on a highway decreases its speed from 30 meters per second to 23 meters per second in 2 seconds. The car's average acceleration during this time interval is

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  1. 13 February, 05:19
    0
    U1 = 30m/s

    u2 = 23m/s

    t=2s

    a = (u2-u1) / t

    a=-7/2=-3.5 m/s^2
  2. 13 February, 08:53
    0
    Use the equation Vf=Vi+A (t)

    Rearrange it so A is isolated: A = Vf-Vi/t

    A = (23-30) / 2

    A=-3.5m/s^2
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