A classmate finds that it takes 1.090 seconds for a tossed ball to touch ground. How many significant figures are in this measurement? A. 4 B. 3 C. 2 D. 1
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Significant figures = Numbers that carry meaning in the measurements of a number.
Zero before a decimal point is not significant.
Zero after a decimal point is significant.
Zero sandwiched between numbers is significant.
From the definitions above :
1.090 has four significant figures.
The answer is A.
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