Step $3$

Using the same method, for the time period $[1,1\mathrm{.}1],$ we have the following.

$v_{\text{a}\text{v}\text{g}}=1\mathrm{.}28-1\mathrm{.}86(,)$

$=1\mathrm{.}09$

$\frac{m}{s}($rounded to two decimal places$)$

Step $4$

Next, for the time period $[1,1\mathrm{.}01],$ we have the following.

$v_{\text{a}\text{v}\text{g}}=1\mathrm{.}28-1\mathrm{.}86(0\mathrm{.}01)$

$=,\frac{m}{s}(roundedto$ two decimal places$)$

And finally, for the time period $[1,1\mathrm{.}001],$ we have the following.