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Finding kinetic energy from force, distance, mass

  1. Nov 21, 2011 #1
    1. The problem statement, all variables and given/known data
    A 1.85-kg rock is released from rest at the surface of a pond 1.00 m deep. As the rock falls, a constant upward force of 3.70 N is exerted on it by water resistance. Calculate the nonconservative work, Wnc, done by water resistance on the rock, the gravitational potential energy of the system, U, the kinetic energy of the rock, K, and the total mechanical energy of the system, E, for the following depths below the water's surface. Let y = 0 be at the bottom of the pond.

    I need to find kinetic energy for three different distances, 0, .5, and 1.
    2. Relevant equations
    Kinetic energy= 1/2mv^2


    3. The attempt at a solution
    I understand the equation. however do not know how to get V. do i need to find acceleration and go from there? or is there a simpler method?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 21, 2011 #2
    Yes, finding the acceleration would be a great place to start
     
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