Physics, 10.02.2021 01:00 leo4687

Une plateforme à roulettes de 48 kg est accrochée à un ressort horizontal dont la constante de rappel est de 20 N/m : l'autre extrémité du ressort est fixée au mur. Le frottement entre la plate-forme et le plancher est négligeable. On éloigne la plate-forme du mur afin d'allonger le ressort de 1.5 m, puis on la lâche (vitesse initiale nulle). Béatrice, dont la masse est de 65 kg, marche à côté de la plate-forme en s'efforçant d'aller à la même vitesse ; quand la plate-forme est au centre de l'oscillation, elle monte dessus. Calculez l'énergie mécanique de Béatrice et de la plate-forme avant qu'elle n'y monte.

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Une plateforme à roulettes de 48 kg est accrochée à un ressort horizontal dont la constante de rappe...

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