Question

A stone is dropped from a 500 m tall building into a pond.
When is sound splash heard?
Given g =10 m/s² ,
speed of sound = 340 m/s.

Answer 1

Hi Deepika  @_@______________________________________________________________Here ,u= 0 m/s g= 10m/s²




h= 500 m
Using S= ut+1/2 at²
           500= 1/2 x 10 t²
           500/5=t²
           100   =t²
                t   = 10 seconds 
So,the stone takes 10 seconds to drop in pond.
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Now, speed of sound= distance/time 
                            340= 500/t
                                 t=500/340
                                 t=1.47sec
sound of splash hears = 10+1.47=11.47 seconds 
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Answer 2

Dropped (s) => 500 m
So, we know,

s= ut + 1/2gt²
putting vlaues
500 = 1/2 × 10 × t²
So, t = 10 second

Then, t for 500 km sound to travel
t = 500/340
  = 1.47 sec

So, splash will be hear in 1.47 + 10 = 11.47 seconds