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delta(v4) = v5 -v3
calcul variation de vitesse
somme(F) = m* delta(v) / delta(t)
la somme des forces appliquée au système delta(v)
Ec = 1/2 * m * v**2
Wab(f) = f * AB * cos(alpha) –> si conservative pas de cos()
delta(Ec) = Ecb - Eca = somme(Wab(F))
delta(Epp) = Eppb - Eppa = -Wab(P)
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