At $24,25,$ and $26$ seconds. By evaluating the data around $25$ seconds, we find that

the acceleration at $25$ seconds is $1\mathrm{.}25$ m$/$s$2$

$($see figure below$).$

Evaluate the acceleration at the following times:

$4$a$)$ For t $=9$ seconds, a $=\_\_\_\_\_\_\_\_\_\_\_\_\_$

$4$b$)$ For t $=10$ seconds, a $=\_\_\_\_\_\_\_\_\_\_\_\_\_$

$4$c$)$ For t $=21$ seconds, a $=\_\_\_\_\_\_\_\_\_\_\_\_\_$

$4$d$)$ For t $=23$ seconds, a $=\_\_\_\_\_\_\_\_\_\_\_\_\_$

$4$e$)$ For t $=26$ seconds, a $=\_\_\_\_\_\_\_\_\_\_\_\_\_$

$5)$ Using your answers to questions $2,3,$ and $4,$ plot the acceleration as a function

of time on the graph below, for the ENTIRE time range, $040$ seconds:

PH$-2011$