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W= 20N * 2,5 m
W=50 J
P=W: t
P= 50J : 0,5 s
P= 100 W
F = 20 N
s = 2,5 m
t = 0,5s
Szukane: P= ?
W= Fs = 20 x 2,5 = 50 J
P = W : t = 50 J : 0,5s = 100 J