Question

A stone is dropped freely into a well of depth 125 m. If velocity of sound is 250 m/s, find the time
to hear the splash of sound?​

Answer 1

Answer:

3 seconds

Explanation:

$v {}^{2} - u {}^{2} = 2as \\ \\ v {}^{2} - 0 = 2 \times 9.8 \times 125 \\ = {v}^{} = \sqrt{(2450)} = 49.4$

time take to hit (t)=displacement/velocity

$125 \div 49.4 = 2.53$

roughly 2.5 seconds

time taken by the sound the distance

125/250=0.5 seconds

total time =2.5+0.5=3 seconds

Answer 2

Answer:

time = t = 2 seconds

Explanation:

Given :

Velocity of sound = v = 250 m/s

depth or distance = d = 125 m

We have,

Time (t) = distance /velocity

=> t = 250/125

=> t = 2 sec.

Thus, the time to hear the splash of sound is 2 sec.