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To calculate the momentum, multiply the given mass and velocity in order to get the answer.
Since the mass is 100 kg and velocity is 20 m/s. Then,
[tex] \bold{\: momentum = mass \times velocity} \\ \bold{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 100 \: kg \times 20 \: m/s }\\ \bold{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \green{2000\: kg \cdot m/s}}[/tex]
[tex] \small \sf Therefore, \: the \: momentum \: is \sf \: \: \purple{ 2000 \: \:kg \cdot m/s}[/tex]