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Probleme n'1 Un bloc de 4 kg est attache a un ressort tel que montre sur la figure. La longueur au repos du ressort est

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Probleme n'1 Un bloc de 4 kg est attache a un ressort tel que montre sur la figure. La longueur au repos du ressort est de 20 cm. Lorsque l'on part le chronometre, la vitesse du bloc est de 0,3 m/s, il se dirige vers le haut et il se trouve en dessous de sa position d'equilibre. On remarque que son energie totale est de 0,72 Joule et l'amplitude de son mouvement est de 10 cm. a) Trouver l'equation du mouvement du bloc. b) Calculer la longueur du ressort a l'instant t = 4 s; 30

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