Odpowiedzi

2009-06-04T13:54:20+02:00
M=5t=5000 kg
v1=72km/h=72*1000/3600 m/s=20m/s
v2=36km/h=36*1000/3600 m/s=10m/s
t=1min=60s
F=?
s=?
a=(v1-v2)/t
a=(20-10)/60
a=1/6 m/s^2

F=m*a=m*(v1-v2)/t
F=5000*(20-10)/60=5000*10/60
F=833N

s=vot+1/2*at^2
s=10*60+1/2*1/6*60^2
s=600+300
s=900m