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F=500 N
s= 12m (parter +3 piętra)
t= 0,5min= 0,5 * 60= 30s
Szukane: P=?
P= W:t
ale W= F * s,
zatem P= F*s/ t
P= 500 * 12/30
P= 6 000:30
P= 200 J