physics

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a bus is moving on a straight highway at 12m/s. as it approaches the total gate, it decelerates at 2.5 m/s2 in 5 seconds. what is the final velocity of the bus?

  • physics -

    Given:
    Vi = 12 m/s
    a = - 2.5 m/s2
    t = 5s
    Required: Vf (final velocity)
    Solution:
    a=Vf^2 - Vi^2 / t
    -2.5 m/s = Vf^2 - (12m/s)^2 / 5s
    -2.5 m/s = Vf^2 - 144m^2/s^2
    -2.5m/s over -144 m^2/s^2 = Vf^2
    0.13 m/s = Vf

  • physics -

    You must mean toll gate.
    After decelerating 5 s at 2.5 m/s^2, it will have reduced its velocity by 12.5 m/s, and will be going backwards, at 0.5 m/s.

    A rather strange situation.

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