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A mass M is dragged by a pulley on a horizontal plane by a force anti-parallel to its displacement. The work done in pulling the mass M is

Options

  1. Azero
  2. Bpositive
  3. Cinfinite
  4. Dnegative

Correct answer

B. positive

Step-by-step solution

w = F S w = FS Here F is antiparallel to S So =180^ and 180=-1 So, work done will be w=- FS i.e work is negative.

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