A sonar device on a submarine sends out a signal and receives an echo `5 s` later. Calculate the speed of sound in water if the distance of the object from the submarine is `3625 m`,

Explanation

Distance of the object from submarine, `s = 3625` m
Time interval of echo return, `t=5` s
Speed of sound in water, `v =?`
The sound travels a total distance 2 s in return journey,
From relation, distance `=` velocity `xx` time `2s = v t`
We have, `v = (2s)/(t)`
Putting values, we get,
`v = ( 2xx 3625)/( 5) = 1450"m s"^(-1)`