Question

Un mobil se deplaseaza 10 min cu 20 m/s,10 min cu viteza de 25 km/h si 15 min cu viteza de 60 km/h.AfLaTI viteza meddie.Ajutorr

Answer 1

t1=10 min=600 s

t2=10 min=600 s

v2=25 km/h=6,94 m/s

d=vm*t

d=d1+d2

t=t1+t2

d1=v1t1=600*20=12000 m

d2=v2t2=600*6,94=4166,66 m

d=d1+d2=12000+4166,66=16166,66 m

t=t1+t2=2*600=1200 s

vm=d/t=16166,66/1200=13,47 m/s