Heather is standing on a bridge 50m above a river . she throws a rock straight down with speed of 20m/s. How much time elapses between her throwing

Heather is standing on a bridge 50m above a river . she throws a rock straight down with speed of 20m/s. How much time elapses between her throwing the rock and the rock hitting the water?

show me clearly I need to understand, Thank you

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