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Math Help - physics question-kinetic friction

  1. #1
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    physics question-kinetic friction

    A 26 kg box is being pushed across the floor by a constant force <103,0,0> N. The coefficient of kinetic friction for the floor and box is .18. At t=6 s the box is at location <10,4,-4>m, traveling with velocity <7,0,0>m/s. What is its position and velocity at t-7.6s?

    I don't know where to start help please?
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  2. #2
    Junior Member
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    Jul 2009
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    you write the equation of motion
    the movement is 1-dimensional so you only need 1 equation

    x=x_0 + v_{x0} (t-t_0) + \frac{1}{2} a (t-t_0)˛

    you got x_0, v_{x0} and t_0 in the text
    you find a with Newton's 2nd law
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