. A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given,and speed of sound.
According to the question: 2 2 v u gh 2 2 v 0 2 10 500 2 v 10000 2 1 v 10000 100 ms We also know that v u gt t 0 10 100 10 t or, Time taken by stone to reach the pond surface ( ) 100 /10 10sec t Therefore, time taken by sound to reach the top from pond surface d v/ 500 / 340 1.47sec So the total time taken for splash being heard at the top 10 1.47 11.47 s
