The position function $of$ a freight train $is$ given $bys(t)=300(t+7{)}^{-2},$ with $sin$ meters and $tin$ seconds.

$(a)At$ time $t=6s\frac{m}{s}\frac{m}{s}$

$(b)At$ time $t=6s\frac{m}{s^2}\frac{m}{s^2}$

$(c)$ Considering the results from $(a)$ and $(b),is$ the train speeding $upor$ slowing down?

The train $is$

since its velocity and acceleration have