Physics

Question

Rebecca jogs in place for two minutes before her track meet. Rebecca weighs 100 pounds. Which of the following statements is true?

A Rebecca has done 200 foot-pounds of work.
B Rebecca has not done work because she has not moved a distance.
C Rebecca would accelerate more quickly is she weighed 120 pounds.
D Rebecca has done 100 foot-pounds of work.

2 Answer

  • The answer is A because it was 2 minutes and she weighs 100 lbs.... so 2(100)=200.... 200 lbs of work
  • Answer:

    B. Rebecca has not done work because she has not moved a distance.

    Explanation:

    In physics, work represents the amount of energy necessary for a force to move a body a certain distance.

    [tex]W=F.d[/tex], where F is the force, d the distance and W the work of the force F.

    Since Rebecca jogs in place, the distance is zero, an so does the work.

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