ASK YOUR TEACHER

For this exercise, use the position function $s(t)=-4\mathrm{.}9t^2+160,$ which gives the height $($in meters$)$ of an object that has fallen for $t$ seconds from a height of $160$ meters. The velocity at time $t=$a seconds is given by

$\underset{ta}{lim}\frac{s(a)-s(t)}{a-t}$

When will the object hit the ground? At what velocity, $v,$ will the object impact the ground?

$$ s

$v=\frac{m}{s}$

given by

$\underset{ta}{lim}\frac{s(a)-s(t)}{a-t}$

When will the object hit the ground? At what velocity, $v,$ will the object impact the ground?

$t=$ s

$v=\frac{m}{s}$