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Negligez le frottement et la gravite pendant l'impact. a) Calculez la vitesse (grandeur et direction) de la balle apres l'impact. b) Calculez la force moyenne

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Negligez le frottement et la gravite pendant l'impact. a) Calculez la vitesse (grandeur et direction) de la balle apres l'impact. b) Calculez la force moyenne du mur sur la balle (grandeur et direction) si la duree de l'impact est evaluee 0.05 s. 5 m/'s e=0.95 O 60

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