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Homework Help: Newton's First and Second Laws

  1. Sep 29, 2010 #1
    1. The problem statement, all variables and given/known data

    A particle is traveling in a straight line at a constant speed of 25.0 m/s. Suddenly, a constant force of 15.0 N acts on it, bringing it to a stop in a distance of 62.5 m.
    (a) What is the direction of the force?
    (b) Determine the time it takes for the particle to come to a stop.
    (c) What is its mass?

    2. Relevant equations


    3. The attempt at a solution

    Okay, I figured out that the direction of the constant force must be opposite of the particle, otherwise the particle will never stop. I am unable to come up with way to solve the problem so if you guys can shed light on what I can do, that will be awesome
  2. jcsd
  3. Sep 29, 2010 #2


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    Science Advisor
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    Gold Member

    You have one of the equations; you need to use the kinematic equations of motion for constant acceleration to find the acceleration and time.
  4. Sep 29, 2010 #3
    Okay, thanks for the direction! I got it now.
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