9514 1404 393
Answer:
592 feet
8.5 seconds
Explanation:
The usual equation used for ballistic motion is ...
h(t) = -16t^2 +h0
Here, we have h0=1168 and t=6, so ...
h(t) = -16(6^2) +1168 = 592 . . . feet high after 6 seconds
__
For h(t) = 0, the value of t can be found from ...
0 = -16t^2 +1168
t^2 = 1168/16 = 73
t = √73 ≈ 8.5
The object will reach the ground after 8.5 seconds.