Use the position function

s$($t$)=4\mathrm{.}9$t$2+300,$

which gives the height $($in meters$)$ of an object that has fallen for t seconds from a height of $300$ meters. The velocity at time t $=$ a seconds is given by the following.

$$lim$$t$$a$$

s$($a$)$ s$($t$)$a $$ t

Find the velocity of the object $($in m$/$s$)$ when

t $=3.$

$($Round your answer to one decimal place.$)$

m$/$s