Physics

Problem

A research vessel is moving directly toward a stationary submarine at a constant speed of

10\,\text{m s}^{-1}

. At the instant the distance between them is

x

, the vessel emits an ultrasonic pulse and receives the echo

3.0\,\text{s}

later. Taking the speed of sound in seawater as

1500\,\text{m s}^{-1}

, find the initial distance

x

between the vessel and the submarine when the pulse was emitted. a)

2280\,\text{m}

2265\,\text{m}

2235\,\text{m}

2250\,\text{m}