Solve the Stone Drop Problem: Acceleration of 9.8m/s^2

[emma123]

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

 

[sporkstorms]

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.