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David fait tournoyer sa fronde au bout d'une corde de 0,9 m au-dessus de sa tte, dans un plan horizontal. Il russit atteindre un point

David fait tournoyer sa fronde au bout d'une corde de

0,9

m au-dessus de sa tte, dans un plan horizontal. Il russit atteindre un point du sol situ

11

m devant lui lorsque la roche est libre de la fronde

1,5

m de hauteur. Par quel facteur doit-il augmenter l'acclration centripte que subit la fronde pour que la roche atteigne l'pe de Goliath situe

0,9

m au-dessus du sol et

18

m de distance?

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