Odpowiedzi

2010-02-07T18:48:39+01:00
M = 2 t = 2000 kg t = ?
s = 1,5 m
P = 5 W

P = W/t
W = F * s
P = (F * s)/t /*t
Pt = F * s/: P
t = F * s / P
t = m * g * s/P
t = 2000 kg * 10 m/s² * 1,5 m / 5 J/s
t = 30000 J / 5 J/s
t = 6000 s
t = 100 min
t = 1 2/3 h

Odp: Musi pracowac 1 2/3 h.