Odpowiedzi

2009-11-11T12:46:32+01:00
T = S/V

t1 = 1km /20 km/h = 0,05 h
t2 = 1000m / 2 m/s = 500 s
t3 = 1000m / 2,5 m/min = 400 min
t4 = 100000cm / 50 cm/min = 2000 min
2009-11-11T15:30:42+01:00
V = s/t
t = s/V
s= 1000m = 1km = 100 000cm

a)
t = 1km / 20 km/h
t = 1/20h = 3 min

b)
t = 1000m /2 m/s
t = 500s = 8 i 1/3 min

c)
t = 1000m / 2,5 m/min
t = 400min = 6 i 2/3 h

d)
t = 100 000 / 50 cm/min
t = 2000 min = 33 i 1/3h


Pozdrawiam! :)
1 1 1
2009-11-11T18:41:33+01:00
20km/h = 5,55 m/s
1000m / 5,55m/s = 180s= 3min

2 m/s
1000m / 2m/s = 500s = 8min 20s

2,5m/min = 2,5* m/60s = 1/24 m/s
1000m/ 1/24 m/s = 24000s= 400min = 6h 40min

50cm/min = 0,5* 0,01m/60s = 5/6 m/s
1000m/ 5/6 m/s = 120000s = 2000 min