# A stone is dropped in a well and the splash is heard after 2.5sec.The speed of sound=330m/s.find the depth of the well

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s= 1/2 x 10 X 2.5 X 2.5

s = 1/2 X 10 X 6.25

s= 62.5/2

s= 31.25m

But I think the question is incomplete as the sound also takes time to reach our ear after reaching the bottom.