Final answer:The real number 300.0 m/s has one significant figure (sig fig) because only 3 is different from zero. This number does not have any interesting digits behind the zero or in front of the zero. The correct answer is A. One.Explanation:The real number 300.0 m/s has one significant figure (sig fig) because only 3 is different from zero. This number does not have any interesting digits behind the zero or in front of the zeroSignificant figures are digits that contribute to the precision of a measurement. In this case, all the digits, including the zeros, are significant because they provide information about the precision of the measurement.For example, if the measurement was written as 300 m/s, it would only have one significant figure because the zeros in this case are considered placeholders and are not significant. However, in 300.0 m/s, all the digits are significant.The correct answer is A. One....

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