Work: Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?
A. Both do positive work, but person X does four times the work of person Y.
B. Both do positive work, but person X does twice the work of person Y.
C. Both do the same amount of positive work.
D. Both do zero work.
E. Both do positive work, but person X does one-half the work of person Y.
Answer: D
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A. A B. B C. C D. D
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