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Answer :
Time (t) taken by the sonar pulse to return = 1.02 s
Speed (v) of sound in salt water = 1531 m/s
Distance travelled by sonar pulse
= Speed of sound × Time taken
\( =1531 \ × \ 1.02 \ \)
\( = \ 1561.62 \ m \)
\( =\frac{1561.62}{2} \)
\(\Rightarrow \) Distance of the cliff from the submarine = 780.81 m .