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Help with Net Work problem.

  1. Nov 19, 2009 #1
    1. The problem statement, all variables and given/known data


    Hickey reached a speed of 35 m/s on his skateboard . Suppose it took 21,000 Joules of net work for Hickey to reach this speed from a speed of 25 m/s. Find Hickey's mass
    2. Relevant equations

    Work = Force x Distance Cos(theta)

    3. The attempt at a solution
    From my believe, the velocity initial is 25 m/s and the final velocity is 35 only m/s. The missing variable is the distance to solve the equation. Is it even possible to find the distance given velocity? Is the problem corrupt?
     
  2. jcsd
  3. Nov 19, 2009 #2

    rl.bhat

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    Homework Helper

    Work done is equal to change in kinetic energy. Work done is given. Use kinetic energy formula and find M.
     
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