Per NCERT, when is the work done on an object equal to ZERO — even if a force is applied?
AWhenever the force is large
BWhenever the force is downward
CWhen there is no displacement (s = 0) — for example, pushing against a rigid wall that doesn't move
DOnly when no force is applied at all
Answer & Solution
Correct answer: C. When there is no displacement (s = 0) — for example, pushing against a rigid wall that doesn't move
Per NCERT §7.1.1, W = F × s = 0 when s = 0 (no displacement). Force without displacement does no work scientifically. The other options misstate.
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