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physics

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A car comes to a stop for a stop sign in 4.6 seconds. If it was initially traveling at 27.5 m/s, how much space did it take for the car to stop?

  • physics -

    Vf=Vi+at solve for a.

    then
    Vf^2=Vi^2 + 2ad solve for d.

  • physics -

    what is Vi?

  • physics -

    vi=27.5m/s

  • physics -

    this is where get stuck
    vf=27.5(a)(4.6)
    vf=126.5
    i don't know the rest

  • physics -

    please help me im realy stuck

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