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A pandubbi send a sonar signal to locate a body and receives the echo after 5s.If the velocity of the sound is 340 m/s. What is the distance of the body?

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1.7 km

0.85 km

0.425 km

4.25 km

answer is C.

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Detailed Solution

$d = \frac{Vt}{2} = \frac{2 .5 \times 340}{2}$

$= 170 \times \frac{5}{2} = 85 \times 5 = 425 m = 0.425 km$

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