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Find velocity

  1. Sep 26, 2011 #1
    1. The problem statement, all variables and given/known data
    The power consumption by a typical house is 1 kW. If the kinetic energy of a car (mass 130 kg) is equal to the total energy used by the house in 1.2 minute, what is the car’s speed?

    2. Relevant equations

    3. The attempt at a solution
    I converted 1kW to 1000 Watts and 1.2 minutes to 72 seconds and put it in to the first equation but don't know how to get F for the second equation.
    Last edited: Sep 26, 2011
  2. jcsd
  3. Sep 26, 2011 #2


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    Energy = Power * time


    Kinetic Energy = mv2/2
  4. Sep 27, 2011 #3
    Do you mean to say that the power consumed by a typical house is 1 kWh?
  5. Sep 27, 2011 #4


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    It is better to say that the house consumes energy at the rate of 1kW. Exactly like the wattage rating on a light bulb. If the house is "on" for 1.2 minutes then you can determine the energy consumed by the house during this interval by:

    Energy = Power * time
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