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A ball is thrown vertically upwards from the ground.Work done by air resistance during its time of flight is …............... Positive during ascent and negative during descent. Positive during ascent and descent. Negative during ascent and positive during descent. Negative during ascent andd descent. Choose the correct one and explain.

A ball is thrown vertically upwards from the ground.Work done by air resistance during its time of flight is …...............
  1. Positive during ascent and negative during descent.
  2. Positive during ascent and descent.
  3. Negative during ascent and positive during descent.
  4. Negative during ascent andd descent.                                   Choose the correct one and explain.

Grade:11

1 Answers

Eshan
askIITians Faculty 2095 Points
5 years ago
Dear student,

During ascent, the direction of displacement is positve, but the air resistance acts downwards. Hence work done is negative.

Similarly, during descent, displacement is negative but the air resistance works upwards, hence work done is negative again.

Regards

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