Un chien tire la corde d'un traîneau de 50 kg en montant une pente inclinée à 20° au-dessus de l'horizontale. La corde est orientée à 30° de la pente et le chien exerce une force de 200 N sur la corde. La force de frottement vaut 50 N. Quelle est l'accélération du traîneau?
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