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Work, Power And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork, Power And Energy1 Mark
MCQ
A ball is thrown vertically up-wards from the ground. Regarding the work done by air resistance, which of the following is correct?
  • A
    Work done is positive
  • ✓
    Work done is negative
  • C
    Work done is zero
  • D
    Work done may be positive or negative
✓

Answer

Correct option: B.
Work done is negative
Air resistance offers retarding force opposite to the direction of instantaneous velocity. As the force acts opposite to the displacement of the body, the work done by it is negative.

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