Subtract 0.2 J from 7.26 J and express the result with correct number of significant figures

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Q: Subtract 0.2 J from 7.26 J and express the result with correct number of significant figures

(a) 7.1 J

(b) 7.06 J

(c) 7.0 J

(d) 7 J

Ans: (a)

Sol: 7.26 – 0.20 = 7.06

Now correcting up to one decimal place correct answer = 7.1 J

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