First slide
Release from certain height
Question

A stone is dropped into a well and the sound of splash is heard after 5.33 sec. If the water is at a depth of 122.5 m from the ground, the velocity of sound in air is

Easy
Solution

Time taken by stone to reach the water
t=2hg=2×122.59.8=5sec
Time taken by sound is 0.33 sec.

velocity of sound S=122.50.33=367m/s

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