17.a. Explain the fundamental forces of nature. b. A SONAR (sound navigation and ranging) used ultrasonic waves to detect and locate objects

underwater. In a submarine equipped with a SONAR, the time delay between the generation of a probe wave

and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the

distance of the enemy submarine? (Speed of sound in water = 1450 m s-1)

( urgently need this answer)​