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Homework Help: Need guidance finding the total energy expanded in acceleration

  1. Dec 11, 2011 #1
    1. The problem statement, all variables and given/known data

    this is the scenario

    A horizontal force of 80N acts on a mass of 6 Kg resting on a horizontal surface. The mass is initially at rest and covers a distance of 5m in 0.92s under the action of the force. Assuming there are no energy losses due to air resistance and therefore that the acceleration is constant

    Calculate the total energy expanded in the acceleration

    2. Relevant equations

    3. The attempt at a solution

    By total energy expanded do I need the:

    Work done = force X distance = 80 X 5 = 400 joules

    Or have I got to find something else?

  2. jcsd
  3. Dec 11, 2011 #2
    also i have tryed working out:

    velocity = distance/ time = 5/0.92 = 5.43 ms -1

    acceleration = change of velocity / time taken = 0 - 5.43 (final velocity) / 0.92 which is 5.902 m s -2
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