simple echo question

by emma123
Tags: echo, simple
emma123 is offline
Mar6-06, 12:55 AM
P: 29
i need help on the following problem:
"carol drops a stone into a mine shaft 122.5 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft?"
i know that the acceleration is 9.8m/s^2 but i can't use it as speed in the speed=distance/time equation
please help me. thanx
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sporkstorms is offline
Mar6-06, 01:33 AM
P: 47
Break the problem into two parts.

Calculate t1, the time it takes the stone to fall from her hand to the bottom of the well.

Then find t2, the time it takes the sound to travel from the bottom of the well to the top.

The total time is just t1 + t2.

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