Answer:
3 seconds
Explanation:
We want to find when h(t) =0
0 = - 12t^2 + 36t
factor out a -12t
0 = -12t( t-3)
Using the zero product property
-12t = 0 and t-3=0
t = 0 and t=3
t=0 is when it is dropped and t=3 is when it lands
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