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A moment is not a fixed amount of seconds; a moment simply means "a short time". Depending on the context, that may mean less than a seconds, a few days, or a million years.
it means initial upwards height times time in seconds
"Mean" means "average"= (distance covered) divided by (time to cover the distance)= ( 90 / 4.5 ) = 20 feet per second
It is 20 seconds.
' = minutes " = seconds