Question

Explanation needed.​

Answer 1

question

A stone is dropped from the top of a building 500 m high into a lake of water at the base of a building when is the splash Heard at the top ??

Ans :-

s = 500 m = distance to travel - for the stone

g = 10 m/sec/sec, initial velocity of stone u = 0

equation of the dynamics of stone :

s = u t + 1/2 g t^2

500 = 0 + 1/2 * 10 * t^2

t = 10 sec

Immediately after touching the water, in a fraction of second, there is a sound wave produced on the surface of water - splashing of water.

time for sound to reach the top

distance to travel / speed =

500 meter / 340 m/sec = 25/17 sec

total time = 10 sec + 25/17 sec

= 10+1.47

= 11.47 second ..

this is your answer..

hope it helps to you.............