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Can someone help me with this?

  1. Apr 10, 2008 #1
    This is the question :|

    A 40 Kg wagon is moving with a constant horizontal velocity of 10 m/s.
    1. How much work must be done to double this velocity?
    2. How much work must be done to halve the original velocity?

    SOmeone please help me. :|
     
  2. jcsd
  3. Apr 10, 2008 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF, nikechristo. We do not do your work for you here on the PF. You must show your work before we can offer tutorial help. That's why there is a Homework Help posting template (which you deleted) that you should use to post your questions. There is a spot at the end to show your work so far.

    So show us how you will approach these problems. What is the definition of work, in terms of forces and other things?
     
  4. Apr 10, 2008 #3
    Thanks for your welcome berkeman. :) Sorry for deleting the default template. I'm new to this forum so i didn't know the rules and regulations.

    Work is done on an object whenever a force makes something move. This is the definition of work.

    The general equation of work done is W = Force applied * distance.

    1. The problem statement, all variables and given/known data\

    A 40 Kg wagon is moving with a constant horizontal velocity of 10 m/s.
    1. How much work must be done to double this velocity?
    2. How much work must be done to halve the original velocity?

    2. Relevant equations

    W = Force applied * distance


    3. The attempt at a solution

    I don't get this question. I need the applied force or the force of friction to solve this question, rite? I don't think there is enough information to solve this, but i may be wrong. Is there a way to find the work done by using the mass and distance?
     
  5. Apr 10, 2008 #4
    The work done is the change in kinetic energy.
     
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