Odpowiedzi

2009-10-30T14:15:55+01:00
Vo=72 km/h = 20 m/s
Vk=0 m/s
a = Vo/t
S = 0,5*a*t^2
S = 0,5*(Vo/t)*t^2
S= 0,5*Vo*t
2*S= V0/t
t = (2*S)/Vo = (2*500)/20 = 1000'20=100/2=50sekund
F=m*a = m*(Vo/t)=75*(20/50)=1500/50=150/5=30 N
F= 30 N