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F=ma
a=v/t
v=54km/h-18km/h=36km/h=10m/s
t=20s
a=10m/s/20s
a=0,5m/s^2
F=800kg*0,5m/s^2
F=400N=0,4kN
Zad 2.
Ek=mv^2/2
m=400kg
v=90km/h=25m/s
Ek=400kg*25m/s^2/2
Ek=5000J=5kJ
3.
Ep=mgh
m=25g=0,025kg
g=10m/s^2
h=40cm=0,4m
Ep=0,1J
Pozdrawiam kari9812
m=800kg
t=20s
Vo=18km/h=5m/s
Vk=54km/h=15m/s
deltaV=Vk-Vp=15-5=10m/s
a= deltaV/t=10/20=0,5 m/s^2
s=Vo*t + 1/2* a * t^2 = 5*20 + 1/2*0,5*400=100+100=200m
F=m*a=800*0,5=400N
Zadanie 2
m=400kg
V=90km/h=90*1000m/3600s=25m/s
Ek=0,5*m*V^2=0,5*400*25^2=200*625=125000J=125kJ
Zadanie 3
m=25g=0,025kg
h=40cm=0,4m
Ep=mgh=0,025*0,4*10=0,1J