Question

2) What is unit? What is SI unit of length ?​

Answer 1

The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299792458 when expressed in the unit m s−1, where the second is defined in terms of ∆νCs."

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Answer 2

In math, the word unit can be defined as the rightmost position in a number or the one's place. ... A unit may also mean the standard units used for measurement.

the SI unit of length is meter. (m)