Calculate the maximum absolute uncertainty for R if: R = B - A
A = 32 +/- 2 seconds
B = 11 +/- 3 seconds

43 seconds

1 second

21 seconds

5 seconds

6 seconds

 ΔR = 5 s

Explanation:

The absolute uncertainty or error in an expression is

       ΔR = | | ΔB + | | ΔA

the absolute value guarantees to take the unfavorable case, that is, the maximum error.

We look for the derivatives

        = 1

        = -1

we substitute

       ΔR = 1 ΔB + 1 ΔA

of the data

       ΔB = 3 s

       ΔA = 2 s

       ΔR = 3 + 2

       ΔR = 5 s

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