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Homework Help: KInetic Energy Basic Calculations

  1. Jan 15, 2013 #1
    1. The problem statement, all variables and given/known data

    6. A 2.5-kg book slides horizontally and falls from a shelf 3.0m above the floor. How much work does the force of gravity do on the book as it falls 3.0m?
    F. 1.2 J
    G. 7.5 J
    H. 24.5 J
    J. 73.5 J

    7. Which of the following is the minimum amount of work done by a hydraulic lift to raise a 150-kg aluminum block 2.0m vertically?
    A. 75 J
    B. 300 J
    C. 1470 J
    D. 2940 J

    8. The motion of roller coasters depends upon the conversion of potential and kinetic energy. a 100-kg car starts from rest at the top of a hill with a height of 50 m. Which of the following is this car's kinetic energy at the bottom of the hill?
    F. 150 J
    G. 5000 J
    H. 49,000 J
    J. 98,000 J

    9. A 0.25-g paint chip comes off a satellite orbiting Earth. The velocity of the paint chip is 7000 m/s. Which is the kinetic energy of the paint chip?
    A. 1750 J
    B. 6125 J
    C. 12,250 J
    D. 24,500 J

    10. An automobile was moving at 15 m/s and accelerated at 2 m/s^2 for 2 s. Which was its final speed?
    F. 17 M/S
    G. 25 M/S
    H. 27 M/S
    J. 35 M/S

    2. Relevant equations

    3. The attempt at a solution
    for 8 I'm getting G or H
    for 9 I'm getting A or B
    for 10 I'm getting J
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 15, 2013 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Pls post your working.
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