Question

ULTIMELE DOUA! REPEDE
DAU COROANA

Answer 1

58.v1=10m/s=10*3600/1000=36km/h
v2=20m/s=72km/h
v=d/t
t=d/v
t1=x1/v1=10/36=0.27 h
t2=20/72=0.27h
t=t1+t2=0.54h
d1=v1*t
d2=v2*t
Vm=D/∆t=(v1+v2)/2=54km/h
59.v1=4m/s
v2=6m/s
cand ai timpi egali ai formula la
Viteza medie=(v1+v2)/2
si cand ai distante egale
Viteza medie=2v1v2/(v1+v2)
Vm=2*4*6/(4+6)=48/10=4.8m/s