2-98
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.
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.