Question

Functions.

Answer 1

what about them

Answer 2

@Michele_Laino

Answer 3

make h(t)=0

Answer 4

then solve for t

Answer 5

we have to solve this equation:
h(t)=0, namely:
\[ - 16{t^2} + 256 = 0\]

Answer 6

so 0=-16t^2 + 256

Answer 7

hint:
time has to be a positive quantity

Answer 8

so t=-4 can not be an acceptable solution

Answer 9

4s