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Kinematics question - friction

  1. Jan 29, 2017 #1
    1. The problem statement, all variables and given/known data
    A force of friction of 3.2N acts on a 1.1Kg puck while it is sliding along a horizontal surface. If the initial velocity of the puck was 7.5 m/s, how far will the puck travel before coming to rest?

    2. Relevant equations

    3. The attempt at a solution
    The answer is 9.7M. Tried multiple time with different formulas but unable to derive at solution.
  2. jcsd
  3. Jan 29, 2017 #2


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    Staff: Mentor

    Hi @Anuj Agarwal, Welcome to Physics Forums.

    You need to show us at least one of your attempts in detail or your thread will be deleted. Just saying you tried and failed does not give us any basis upon which to help you.
  4. Jan 29, 2017 #3
    Sorry. Here is my try: F =mxa hence a = f/m=3.2/1.1=2.9
    A=v/s, hence s=v/a =7.5/2.9=2.58
    Distance = velocityxtime = 7.5x2.58=19.3 m
  5. Jan 29, 2017 #4
    The last line is wrong. This would only be true if the velocity were constant. The fact that your answer is twice as big as it should be should give you a clue.
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