Physics

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

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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Single Correct Medium Published on 18th 08, 2020
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