Réponses

2014-04-10T09:51:40+02:00
a) V=Dr/t donc Dr=V*t
Dr=27,8*0,75=20,85m

b)  D_{F}=  \frac{ V^{2}}{2*g*A}= \frac{27,8^{2}}{2*9.81*0,6}=65,65m

V= \sqrt{2gAD_{F}}

V= \sqrt{2*9,81*0,4*65,65}=22,7m.s^{-1} soit 81,7 km/h