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Just substitute the given values in the formula.
Try typing it in utube there are soem great vidoes there maybe something that could help you solve this.
Just substitute, you’re given everything you need.
h = 1/2 * g * t^2
h = .5 * 980 cm/sec * 20^2 sec
h = 196000 cm s (centimeter seconds)
I think at least, not exactly sure about if it’s 20^2 seconds or (20 seconds)^2, but you get the idea
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