Question

what is the S.I. unit of time.
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Answer 1

Answer:

The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency Cs. , the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1.The SI unit of time is second (s) and for distance is metre (m). So the SI unit of speed is metre per second (m/s). Speed is also measured in kilometre per hour (km/h). The average speed of a moving object is defined as the total distance covered by it divided by the total time taken.

Explanation:

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Answer 2

Explanation:

the second symbol s is the si unit of time