Va rog dau coroana si ma abonez la voi.

I.
1. in repaus
2. in miscare
II.
90 km/h=90 000 m/3600 s= 25 km/h
1800 cm/min= 18 m/60 s= 0.3 km/h
III.
1. De la 8:10 pana la 9:40 trec 90 de minute, 1+1/2 ore
2. d=150-30=120 km
3. v=d/t=120 km/1.5 h= 80 km/h
IV.
1. 18 km/h= 18/3.6 m/s= 5 m/s
2. d=v*t=5*60*30=9000 m=9 km