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Calculating time of object given its speed

  1. Jul 24, 2016 #1
    1. The problem statement, all variables and given/known data
    You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 121 m/s. How much time does it take for the impulse, which travels a distance of 1.77 m, to reach your brain?

    seems like an easy question but have never learned how to do this.


    2. Relevant equations


    3. The attempt at a solution

    thought it could be t=d/s but it gave me the wrong answer
     
  2. jcsd
  3. Jul 25, 2016 #2

    haruspex

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    please post your answer, and the official answer if you know it.
     
  4. Jul 25, 2016 #3
    My mistake, i was doing it correctly but rounding to 2 dp when they wanted 3dp.
     
  5. Jul 25, 2016 #4

    haruspex

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    Ok!
    For what it's worth, nerve impulses from the limbs do not need to reach the brain before you react. Circuits in the spinal cord act first.
     
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