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Homework Help: Physics help please determining distance of box pushed

  1. Feb 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A block has a mass of 20kg is at rest on the floor. This block is then pushed by a horizontal force of 8N across the floor. The final speed is 2 m/s. Determine the distance the box was pushed.

    2. Relevant equations
    a=(chand in velocity)/(change in time)

    3. The attempt at a solution
    Using all three equations I found the distance to be 10m. But this answer is incorrect. I can't figure out what I am doing wrong.
  2. jcsd
  3. Feb 14, 2010 #2
    have you used the kinematic equation Vf^2 - Vo^2 = 2*a*displacement ?

    I think you figured out acceleration a, properly...(assume we have a frictionless surface). So if you know a, Vf and Vo, you can figure out displacement (or distance the box moved).
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