Question

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Answer 1

I just need help with what formula to use. I'm really unsure of how to do it.

Answer 2

This might take me a minute, I'm rubbish at drawing formulas on here

Answer 3

\[f =\frac{ (c+V _{r}) }{ (c+V _{o}) } f _{o}\]

Answer 4

Right then! that's your formula, here's your variables.

f = original frequency 400hz
\[f _{o} =the observed frequency, 429 hz\]
c = the speed of sound, 330m/s
Vo = the observers speed relative to the train, which in this case is 0
Solve for Vr!

Answer 5

Thank you!