To perform fast fourier transform on the data derived in the Excel for the behaviour of a Wilberforce pendulum, you can import the data into MATLAB and then use the built in 'fft' function to perform the fourier transform.
Here is a sample code for reference:
data = readmatrix('filename.csv');
%assuming data has two columns; time and displacement.
time = data(:,1);
displacement = data(:,2);
%calculate the frequency resolution.
Fs = 1/(time(2)-time(1));
N = length(displacement);
f_resolution = Fs/N;
%perform fourier transform.
amplitude = abs(fft(displacement))/N; %amplitude spectrum
freq = (0:N-1)*f_resolution;
plot(freq,amplitude);
xlabel('frequency (Hz)');
ylabel('Amplitude');
