Answer: second.
- A second
- B minute
- C hour
- D day
Correct answer: A. second
Explanation: The second (s) is the SI base unit of time.
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.