72км/ч = 20м/с
∆р = р2-р1=mv2-mv1 =m(v2-v1); m = ∆p/(v2-v1) = 120/ |26-20| = 120/6 = 20кг
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72км/ч = 20м/с
∆р = р2-р1=mv2-mv1 =m(v2-v1); m = ∆p/(v2-v1) = 120/ |26-20| = 120/6 = 20кг