Answer to Question #234921 in Physics for Potchie

Question #234921

Jennie dropped a stone from the top of the blackpink house which is 400 m high.

How long will it take for the stone to reach the ground?

Expert's answer

Given:

"H=400\\:\\rm m"

The time of free falling of the stone

"t=\\sqrt{2H\/g}=\\sqrt{2*400\\:\\rm m\/9.8\\:\\rm m\/s^2}=9.0\\:\\rm s"

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