Un tren a parcurs distanta de 40 km dintre doua stati in timp de 50 min . Care este viteza medie a trenului exprimata in km/h si m/s?
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Dau coroana !


Răspuns :

Vm=d/Dt
Vm=40km/50min
Vm=40×1000m/50×60s
Vm=40000m/3000s
Vm=40m/3s=13,(3) m/s

Vm=40m/3s×3,6/1=40m/3s×36/10
Vm=48 km/h

t=50 min=0,833 h

d=vm*t=>vm=d/t=40/0,833≈48 km/h