Odpowiedzi

2009-11-30T22:57:29+01:00
P = 1kW = 1000W
h = 5m
t = 100 s

P = W/t
W = P*t = 1000*100 = 100 000 J

W = Ep = mgh
m*10*5 = 100 000
50*m = 100 000
m = 2000 kg