Question

two conditions in which work done is said to be zero?
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Answer 1

Answer:

Two conditions when the work done is zero are: (i) When there is no displacement (S=0) and, (ii) When the displacement is nonual to the direction of the force (θ=90o).

Answer 2

Explanation:

Two conditions when the work done is zero are: (i) When there is no displacement (S=0) and, (ii) When the displacement is nonual to the direction of the force (θ=90o).