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V1 = ?
m2 = 0,02 kg
V2 = 650 m/s
korzystamy z zasady zachowania pędu: p1 = p2
p1 = pęd karabinu
p2 = pęd pocisku
p1 = p2
m1* V1 = m2 * V2
V1 = m2 * V2 / m1
V1 = 0,02 kg * 650 m/s / 4,5 kg ; kg się skrócą
V1 = .......m /s