Problem 2-98 - Linear Kinematics

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.

diagram of helicopter


In order for this problem to have a reasonable solution:

(A)  The signal speed must be greater than that of the helicopter.

(B)  The signal speed must be less than that of the helicopter.