Question 1149519
.
<pre>

At t=0,  the value of the given function is  64 --- hence, the height from which the sunglasses were dropped is 64 feet.



It will hit the ground when  h(t) = 0 = -16*t^2 + 64 = 0  ====>


    16t^2 = 64  ====>  t^2 = {{{64/16}}} = 4  ====>  t = {{{sqrt(4)}}} = 2 seconds.
</pre>

All questions are answered ====>  the problem is solved successfully.