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p=v*m
v₁=3000km/h
m₁=30kg
v₂=?
m₂=10 ton=10 000 kg
p₁=p₂
v₁*m₁=v₂*m₂
30*3000=10 000*v₂
v₂=90 000/10 000
v₂=9 [km/h]