$[0\mathrm{.}24/0\mathrm{.}33$ Points$]$

$$ OSCOLALG$13\mathrm{.}3\mathrm{.}901.$WA$.$TUT.

The height of an object off the ground, $h($in feet$)t$ seconds after it is launched into the air is given by

$h(t)=-16t^2+128t,0t8$

Find the average rate of change of $h$ over the interval $4,8.$

$$ feet per second

Interpret your result.

During the last four seconds of the objects's time in the air, it is $$ falling at an average rate of $$ feet per second.

Enter an exact number.