If a ball is thrown straight up into the air with an initial velocity of $45f\frac{t}{s},$ it height in feet after $t$ second is given by $y=45t-16t^2.$ Find the average velocity for the time period beginning when $t=2$ and lasting for $0\mathrm{.}1sec,0\mathrm{.}01sec,0\mathrm{.}001sec,$ and $0\mathrm{.}0001sec.$ Enter exact answers.

$($i$)0\mathrm{.}1$ seconds

$($ii$)0\mathrm{.}01$ second

$($iii$)0\mathrm{.}001$ seconds

$($iv$)0\mathrm{.}0001$ seconds

Finsllv haced on the above results, guess what the instantaneous velocity of the ball is when $t=2.$

$f\frac{t}{sec}$

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