Which one of the following violate the law of conservation of momentum Mass before: 5 kg, velocity before: 3 m/s mass after: 6 kg, velocity after: 2 m/s

Mass before: 4 kg, velocity before: 3 m/s mass after: 3 kg, velocity after: 4 m/s

mass before: 4 kg, velocity before: 3 m/s mass after: 6 kg, velocity after: 2 m/s

a) All
b) None
c) Bottom only
d) Top only