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Answer:
~ 1 second
Explanation:
y = vo t + 1/2 at^2 vo = 0 ( it starts from rest) a = -9.81 m/s^2 y = 4.82 m
4.82 = 1/2 ( 9.81) t^2
t^2 = .98267
t=.99 = ~ 1 second