Answer:
3.16
Step-by-step explanation:
At the ground, h = 0.
h = -16x^2 + 160
0 = -16x^2 + 160
16x^2 = 160
x^2 = 10
x = +\- sqrt(10)
Since we cannot have a negative time, we discard the negative answer.
Answer: 3.16 seconds
try c im sorry if im wrong i tried