Source: http://web.a9lame.com/Documents/Lyc%C3%A9e/Bac%20FR/a-Tronc%20commun%20International/a-Tronc%20commun%20Science/b-Physique/a-Semestre%20I/d-Le%20principe%20d%E2%80%99inertie/d-Exercices/Exercices%2012%20Le%20principe%20d%E2%80%99inertie%20non%20corrige.pdf