Work done in physics can be:I. ZeroII.

Solution

Work done in physics can indeed be zero, positive, or negative:
- Zero work occurs when force is applied without displacement or when force is perpendicular to displacement (e.g., carrying a bag horizontally).
- Positive work happens when force and displacement are in the same direction (e.g., pushing an object forward).
- Negative work occurs when force and displacement are in opposite directions (e.g., friction opposing motion).
Mathematically, work (W) = Force (F) × Displacement (d) × cos(θ), where θ is the angle between force and displacement. When θ = 0°, work is positive; when θ = 180°, work is negative; and when θ = 90°, work is zero.