Physics

Subtract $$0.2\;J$$ from $$7.26\;J$$ and express the result with correct number of significant figures.


ANSWER

7.1 J


SOLUTION
Rule: In addition or subtraction, the final result should retain as many decimal places as are there in the number with the least decimal places.
Arithmetic subtraction $$= 7.06 J$$
But least precise measurement $$ 0.2 J,$$ is correct to only one decimal place.
So final result $$=7.1 J$$
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