define length .what is its SI unit?
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The meter, 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 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of ΔνCs. Unit of mass. kilogram. The kilogram, symbol kg, is the SI unit of mass.
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Answer:
longness of a particular object is called length
it's SI unit is M.
meter
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