Physics

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With an average acceleration of −2.2 m/s^2,
how long will it take a cyclist to bring a bicycle
with an initial speed of 14.5 m/s to a complete
stop?
Answer in units of s.

  • Physics -

    v = Vi + a t
    0 = 14.5 - 2.2 t
    t = 14.5/2.2
    t = 6.59 s

    next get the distance
    x = Xi + Vi t + (1/2) a t^2
    x = 0 + 14.5(6.59) - 1.1(6.59)^2
    = 95.6 - 47.8 = 47.8 meters
    wow, half a football field !

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