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P = 1,2 kW = 1200 W = 1200 J/s
F = ?
P = W/t
W = F*s
P= F*s/t ; a.e s/t = V
P = F*v
F = P/V
F = 1200 J/s /20 m/s
F = 60 N
[J/s*s/m] = [J/m] = [N*m/m] = [N]