A stationary destroyer is equipped with sonar that sends out pulses of sound at 35.000 MHz. Reflected pulses are received from a submarine directly below with a time delay of 95 ms at a frequency of 34.958 MHz
(a) If the speed of sound in seawater is 1.57 km/s, find the depth of the submarine.
m
(b) Find its vertical velocity. (Take upward to be the positive direction.)
m/s