Q. Work done is zero when

किया गया कार्य शून्य है जब

Displacement is zero
विस्थापन शून्य है

Force is zero
बल शून्य है

Angle between force and displacement is 90°
बल और विस्थापन के बीच का कोण 90° है

All of these
इन सब

Work done is zero in all these cases:

If displacement is zero, the object doesn’t move, so no work is done.
If force is zero, no force acts on the object, so no work is done.
If the angle between force and displacement is 90°, the force is perpendicular to displacement, so the force does not contribute to displacement in its own direction (work done = Force × displacement × cos 90° = 0).

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