Answer
The instantaneous velocity at t = 1 equals the $\lim\limits_{h \to 0}$ of the average velocity during the interval of t = 1 and t = 1 + h that is [1,1+h].
Work Step by Step
The instantaneous velocity at t = 1 equals the $\lim\limits_{h \to 0}$ of the average velocity during the interval of t = 1 and t = 1 + h that is [1,1+h].