Q7 of 44 Page 5

Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s–1 ± 0.5 m s–1 B = 0.10 s ± 0.01 s The value of A B will be

Given,




Let, X=AB


X=AB=


Precision can be calculated by,


If is the error in the X, be the error in A and be the error in B, then relative error is calculated as .


Therefore now,


(For the formula part refer to


NCERT class 11 part 1 unit


and measurement chapter)




Rounding off 0.075 to two significant figures we get,



Therefore, the value of AB is .

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