Dropping a Stone: Calculating Time for a Stone to Hit the Bottom of a Mineshaft

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SUMMARY

The discussion focuses on calculating the total time it takes for a stone to hit the bottom of a 122.5 m deep mineshaft and for the sound of the impact to travel back to the girl. The key formulas involved are those for constant acceleration, specifically using the equation of motion to determine the time of free fall. Additionally, the speed of sound must be factored in to calculate the time taken for the sound to reach the girl after the stone hits the bottom.

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A girl drops a stone into a mineshaft 122.5 m deep. How soon after she drops the stone does she hear it hit the bottom?

What formula do I use?
 
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You are looking for the constant acceleration formulas. A quick search on google or wikipedia should provide them. Also don't forget about the period of time that sound would take to travel from the point of impact to the girl's ear. You can find the speed of sound with a google search too. =)
 
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