Odpowiedzi

2009-10-10T15:16:01+02:00
Dane:
v_p = 54 km/h = 54 1000/3600 m/s = 54 10/36 m/s = 15 m/s
v_k = 0
s = 200 m

szukane:
t = ?

a = (v_p - v_k)/t = v_p/t
s = at²/2

s = (v_p*t²/t)/2
s = (v_p*t)/2
2s = v_p*t
t = 2s/v_p

t = (400 m)/(15 m/s) = 26 2/3 s
1 2 1
  • Użytkownik Zadane
2009-10-10T15:16:12+02:00
V= 54 km/h
s= 200m
t=?
t=s/V
t=200/54
t=3,7 s
1 1 1
2009-10-10T16:58:48+02:00
Dane:
v_p = 54 km/h = 54 1000/3600 m/s = 54 10/36 m/s = 15 m/s
v_k = 0
s = 200 m

szukane:
t = ?

a = (v_p - v_k)/t = v_p/t
s = at²/2

s = (v_p*t²/t)/2
s = (v_p*t)/2
2s = v_p*t
t = 2s/v_p

t = (400 m)/(15 m/s) = 26 2/3 s