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s = v*t * 1.5 * 7200 = 10800 m
w= 400N * 10800 = 432 * 10^4 J
F = 400N
t = 2h = 7200s
W - ?
W = F x V x t
W = 4 320 000J = 4 320kJ
Odp.Ten koń w czasie 2 godzin wykona pracę 4 320kJ.