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Newton's Second Law HW Problem

  1. Sep 23, 2009 #1
    In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 42 m/s (around 90 mi/h) in a time of 8.1 s. The mass of the car and riders is 4800 kg. Find the average net force exerted on the car and riders by the magnets.


    my solution:

    first i calculated the acceleration which is 5.19m/s squared. then i used F=ma, and that gave me 24,912kg m/s squared. am i correct?
     
  2. jcsd
  3. Sep 23, 2009 #2

    Doc Al

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    Staff: Mentor

    Looks good (assuming the car moves horizontally and the magnet is the only thing exerting a force on it). FYI: The unit of force is called the Newton. 1N = 1 kg-m/s^2.
     
  4. Sep 23, 2009 #3
    thanks doc
     
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