A submarine sends out two successive ultrasound pulses apart toward an underwater cliff

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A submarine sends out two successive ultrasound pulses

15\,\text{s}

apart toward an underwater cliff. The first echo is received

4.0\,\text{s}

after the first pulse is sent, and the second echo is received

3.7\,\text{s}

after the second pulse is sent. If the speed of sound in sea water is

1500\,\text{m/s}

, determine the speed at which the submarine is moving toward the cliff. (a)

20\,\text{m/s}

(b)

15\,\text{m/s}

(c)

10\,\text{m/s}

(d)

30\,\text{m/s}