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Fuerza de rozaniento : Fr
Fr = u N
Fr = (0.3)(mg)
Fr = 0.3×0.4×9.81
Fr = 2943/2500
Fr = 1.18 N
Sum de fuerzas = masa × aceleracion
F-Fr = (0.4)×(7)
F - Fr = 2.8
F = 2.8 + Fr
F = 3.9772 N