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Kinematics problem for a box

  1. Jan 24, 2010 #1
    1. The problem statement, all variables and given/known data
    A 95-kg box is sliding along a level floor with a vi of 15m/s.

    a) how large of a constant frictional force is needed to stop to box in a distance of 15m?
    b)What is the coefficent of friction between the box and the floor.

    2. Relevant equations

    I tried to use vf^2=vi^2+2ad.

    3. The attempt at a solution
    i used the above equation and i found the acceleration by putting vf as 0 but i am stuck.
  2. jcsd
  3. Jan 24, 2010 #2


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    Homework Helper

    If you can find the acceleration, why can't you find the force needed to produce that acceleration? F=ma.
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