Răspuns :
a) V=d/t= 7,5km/5h= 1,5 km/h
b)V=d/t= 7,5km/3h= 2,5 km/h
c)ma= (1,5+2,5)/2= 4/2= 2km/h -media intre cele 2 viteze
b)V=d/t= 7,5km/3h= 2,5 km/h
c)ma= (1,5+2,5)/2= 4/2= 2km/h -media intre cele 2 viteze
t-timp
d-distanta
t=5 ore
d=7.5km
v-viteza
1)v1=d/t=7.5/5=1.5 km/h
2)t=3 ore
v2=d/t=7.5/3=2.5km/h
3)Viteza medie = (v1+v2)/2=(1.5+2.5)/2=4/2=2km/h
d-distanta
t=5 ore
d=7.5km
v-viteza
1)v1=d/t=7.5/5=1.5 km/h
2)t=3 ore
v2=d/t=7.5/3=2.5km/h
3)Viteza medie = (v1+v2)/2=(1.5+2.5)/2=4/2=2km/h