Réponses

2014-05-10T18:56:40+02:00
1) P = mg
P = 70 * 9.8
P = 686 N

2)
a) Oui. (5.1/3)=(17/10)=(42.5/25)=(68/40)=(93.5/55)=1.7
b) g = 1.7
c) Oui. 9.8 / 1.7 = 5.76