To unwrap a tape roll with a length of $50\,\text{m}$, a steady force of $20\,\text{N}$ is needed. How much work is done in unwrapping the entire roll?
- A$0.4\,\text{J}$
- B$2.5\,\text{J}$
- C$500\,\text{J}$
- D$1000\,\text{J}$
Physics 9702 · AS & A Level · Energy conservation