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[248.72836013480105,130.48529452371955];
[248.02965820461168,132.6096362503714];
[247.80260665872567,133.50841233334808];
[247.81412094248327,134.51421150008545];
[244.64706599998948,136.4148856774502];
[245.82415633232517,135.50766909505893];
[243.8204791002475,136.49573673630184];
[242.69314390594934,137.4465014056607];
[242.85808988208674,137.5436943071025];
[242.9531872050389,137.59912969496247];
[243.84432326444835,137.51672300183384];
[243.8146709829423,137.50346518588634];
[242.63244595019728,138.41005762040018];
[245.03041356066416,136.56560867184956];
[244.04420441953346,135.60554679164892];
[241.1277771198288,135.60611500711997];
[241.81701498514292,133.51645095224194];
[240.6309367042565,131.43690780433448];
[239.84772772654026,128.50206033793728];
[241.88084681814837,125.54415084167516];
[243.77427754816165,122.50002358141697];
[243.75158184419854,120.4713488131082];
[242.43415143391735,120.34364806678181];
[245.92524170640536,117.58053608158076];
[247.60063760189234,115.46973178452365];
[248.6535165025956,114.45171793029937];
[248.90557904066435,114.52175626585571];
[248.84243562554923,114.49718853961605];
[248.66685547374271,113.4745792465238];
[246.89021313989866,112.43166633756672];
[246.83122631281026,110.54467499757965];
[243.04995405336496,110.52044803864021];
[238.59588930162033,111.49736625929341];
[233.90638017508695,114.39509550112757];
[229.76756434466677,117.38044511350711];
[228.8095063050473,118.4814025846922];
[225.5004088218742,120.42897035170148];
[222.7925548314788,122.5043859359962];
[221.65264061851371,124.51909038695018];
[222.39433642016292,125.47884851265303];
[221.22623357948277,126.4906645709388];
[220.79648676024038,126.49481048305339];
[219.9986471684582,126.3200456747511];
[220.30086798085512,125.46559717400649];
[221.92452993209258,125.52740916483467];
[225.25693528564852,126.48345859457766];
[224.44856936083727,128.45635758366274];
[227.34832890445074,130.43938367468024];
[230.93116925896334,131.5614814247053];
[231.31828709108345,134.45135159404566];
[231.6936664535192,136.39470733718508];
[235.07407704970433,138.5149916060958];
[238.15091092107082,138.6144084658281]];

DD=sqrt(sum((A.-B(1:111,:)).^2,2));

DY=A(:,1)-B(1:111,1);
DX=A(:,2)-B(1:111,2);
W=atan2(DY,DX);

CC=[];
DC=[];
for i=1:111
  alpha=W(i);
  M=[[cos(alpha),-sin(alpha)];[sin(alpha),cos(alpha)]];
  CC=[CC;(C(i,:)-A(i,:))*M/DD(i)];
  DC=[DC;(D(i,:)-A(i,:))*M/DD(i)];
endfor

P1=polyfit((1:111)',CC(:,1),2);
P2=polyfit((30:80)',CC(30:80,1),2);

plot([CC(:,1),polyval(P1,1:111)',polyval(P2,1:111)'])

P1(1)/P2(1)*9.81