Physics

Problem

A submarine sends an ultrasonic pulse straight downward into the sea and receives the echo after

0.06\,\text{s}

. If the speed of sound in seawater is

1.5\,\text{km/s}

, find the depth of the sea at that point. a)

90\ \text{m}

22.5\ \text{m}

45\ \text{m}

75\ \text{m}