Multiple choice

If two weightlifters A and B lift a 100-pound barbell above their heads in 20 seconds and 10 seconds, respectively to same heigth which of the following statements is/are correct?

  1. Both lifters do the same amount of work.

  2. No work is done.

  3. Lifter A does twice the amount of work as that of B.

  4. Lifter A does half the amount of work as that of B.
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A Correct answer
Explanation

Both lifters A and B do the same amount of work because they apply the same force to lift the same barbell above their heads and the displacement  is also same W = FS cos0 = FS 

F is force applied  , S is the  displacement in same direction

 

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