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m = p / v = 300 / 150 = 2 kg
5][ b
F = ∆p / t = 10 / 2 = 5 N
6][ a
I = m (Vt - Vo) = 0,05 (-20 - 10) = 1,5 Ns
7][ d
F = I / t = 5 / 0,005 = 1000 N