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Deux coureurs. Le premier coureur C1 cours sur une piste de 400 m et le coureur C2 sur une piste de 200 m. Il s'agit de deux pistes circulaires concentriques. Le premier coureur C1 cours à une vitesse linéaire v1 = 20 km/h (VMA). 1. Calculez la durée T permettant au coureur C1 d'effectuer un tour de piste.

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