(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[PLAIN]http://www.antonine-education.co.uk/Physics%20A%20level/Options/Module_8/Topic_6/cars_4.gif [Broken]

What is the speed of sound, relative to:

A -

B -

C -

2. Relevant equations

None.

3. The attempt at a solution

For B, since B is a stationary reference point, the speed of sound relative to B should 330ms^-1

For A, I thought it should be 360, since A is a moving reference in the same direction as the speed of sound. Meaning A = 330+30=360

For C, I thought it should be 300, since the moving reference is moving in the opposite direction to the speed of sound, making B=330-30=300

My answers for A and C are wrong, however. Help!

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# Homework Help: Speed of sound, frames of reference

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