How Far Does a Tuning Fork Travel While Emitting Sound Waves?

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Homework Statement

A tuning fork vibrating at 512 hertz falls from rest and accelerates at 9.81 m/s^2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point? take the speed of sound in air to be 340 m/s. (don't forget it takes the sound extra time to reach the release point)

Homework Equations

v = f x wavelength
v = d/t

The Attempt at a Solution

i don't know how to approach this problem, i was thinking of using kinematics but i don't know what v2 is and i wouldn't using the frequencies given

 

[Vuldoraq]

Hey,

I think you need to use the equation for the Doppler effect on moving sources to find $$V_{2}$$ then apply the kinematic equations for uniform acceleration. Have you come across the Doppler effect before?

Vuldoraq