A ball is thrown vertically up-wards from the ground. Regarding the work done by air resistance, which of the following is correct?
Work done is positive
Work done is negative
Work done is zero
Work done may be positive or negative
A
Work done is positive
B
Work done may be positive or negative
C
Work done is negative
D
Work done is zero
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Solution
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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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