Question

a stone is dropped from roof of a building takes 5 seconds to reach the ground. the sound of stricking is heard after 5.4 seconds after the stone is dropped. the velocity of the sound is?

THE ANSWER IS 312.5m/s. BUT PLEASE TELL THE SOLUTION 1!​

Answer 1

Here in this case ,

Here u=0t=5 sg=10m/s2

So , distance travelled ,S=12gt2=12×10×25=125 m.

So the speed of sound=Distance travelled/Timetaken

=1255·4-5

=1250·4

=312·5 m/s