Answer: metre.
- A metre
- B kilogram
- C second
- D kelvin
Correct answer: A. metre
Explanation: The metre (m) is the SI base unit of length.
The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.
Concept context
SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.