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Rounding Off

subtract 0.2 ...

Question

subtract 0.2 Joule from 7.26 Joule and Express the result with correct number of significant figures

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Solution

according to rule of significant figure answer must be 7J. as 7.26-0.2=7.06 J , since 0 is left from 6 . hence exact answer after rounding off will be 7.1J.

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