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2. A ship on the surface of water sends a signal and receives it back after 4 s from a

submarine inside water. If the velocity of sound in water is 1450 m/s, what is the
distance between submarine and ship?

3. 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.

4. A ship sends out ultra sound that returns from the seabed and is detected after 4s.

If the speed of ultra sound through sea water is 1550 m/s, find the distance of the

seabed from the ship.

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