Problem 2-98 - Linear Kinematics - Part 4 - (a)

 A helicopter is traveling horizontally, straight toward a cliff. When \(700 \;m\) from the cliff, it sends a sonar signal and \(3.4\; s\) later receives the reflected signal. Assuming the signal travels at \(350 \;m/s\), determine the speed of the helicopter.

Accumulated Solution

\(d = vt \\ d = (350\; m/s)(3.4\; s) = 1190\; m \\ \text{The helicopter encounters the echo} \; 1190 - 700 = 490\; m\; \text{ from the cliff.}\)

Correct.

The helicopter encounters the echo \(1190 - 700 = 490\; m\) from the cliff.

How far has the helicopter traveled during the \(3.4\; s\)?

(A)   \(1190 - 490 = 700\; m\)

(B)   \(700 - 490 = 210\; m\)

(C)   \(1190 -700 = 490\; m\)