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P=w/t Power question

  1. Feb 6, 2010 #1
    1. The problem statement, all variables and given/known data
    How powerful is a student who can lift 60kg from the floor to above their head (2.5 meters from the ground) in 4 seconds?

    2. Relevant equations
    To find power we would use the equation
    P= W/T

    3. The attempt at a solution
    I'm not sure if we would use the P=w/t equation, and work is an unknown variable, and when I try to find W, W=FxD, Force is also an unknown variable
  2. jcsd
  3. Feb 6, 2010 #2
    Re: Power

    What is the force on the object due to gravity (this would also be the force required to lift it)?
  4. Feb 6, 2010 #3
    Re: Power

    Would the force on the object due to gravity be 9.8N
    so the Force required to lift it is 9.8 N
  5. Feb 6, 2010 #4
    Re: Power

    Force due to gravity is mg. Then use that and the distance to find the work, and the work and the time to find the power.
    Last edited: Feb 6, 2010
  6. Feb 7, 2010 #5
    Re: Power

    Keep in mind that the force by gravity is not 9.8 N but rather m(9.8 m/s^2) where 9.8 = g. This would be different if we were on a planet other than our homely earth.
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