Odpowiedzi

2009-10-24T20:48:02+02:00
2009-10-24T20:48:57+02:00
18 km/h= 18 1000m/3600s= 18000/3600 m/s= 5 m/s; )
31 4 31
2009-10-24T20:50:17+02:00