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Homework Help: Energy question

  1. Mar 1, 2013 #1
    1. The problem statement, all variables and given/known data

    A 3.0 kg object travels vertically at a constant speed of 2.0m/s. What is the increase in gravitational potential energy after 4.0 sec?

    2. Relevant equations

    Ep=Mgh

    3. The attempt at a solution

    I know i need to find the height but, with constant velocity i dont know how to plug into any kinematic equations to find the height.

    The answer is 2.4 x 10^2 J.
     
  2. jcsd
  3. Mar 1, 2013 #2
    A change in gravitational potential energy results from a change in height. You can find that change in height using kinematics equations.
     
  4. Mar 1, 2013 #3
    Yes, i know that part...but i have no idea how to plug into the kinematic equations with a constant velocity. All the equations are involved with a initial velocity and a final velocity.
     
  5. Mar 1, 2013 #4
    At constant speed v, what is the distance covered during some time t?
     
  6. Mar 1, 2013 #5
    omg thanks!! I totally forgot the most basic one, V= d/t!!
     
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