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Homework Help: Fairly easy acceleration problem stumping me

  1. Sep 11, 2010 #1
    1.Calculate the amount of force required to bring to rest an object of 900 Kg mass that moves with a speed of 20 m/s. The moving object is brought to rest in a time equal
    to 0.1 s. Provide your answer in both N and KN units.



    i think to solve this i just need to find force F=M x A



    3. I divided 20m/s by the time interval of 0.1s to get acceleration then timed it by the mass of 900kg. the answer i got is 1,800,000N or 1800KN
     
  2. jcsd
  3. Sep 11, 2010 #2

    ehild

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    Are not there too many 0-s?

    ehild
     
  4. Sep 12, 2010 #3
    ah yes i times the 0.1 by 200m/s not 20m/s so the answer would be 180,000N or 180KN
     
  5. Sep 12, 2010 #4

    ehild

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    Correct:smile:

    ehild
     
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