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Answer: 140,000
Explanation:
You simply add both of the momentums.
([tex]m_{1}[/tex] x [tex]v_{1}[/tex]) + ([tex]m_{2}[/tex] x [tex]v_{2}[/tex])
[tex]m_{1}[/tex] = 4,000kg
[tex]v_{1}[/tex] = 25m/s
[tex]m_{2}[/tex] = 2,000kg
[tex]v_{2}[/tex] = 20m/s
(4,000kg x 25m/s) + (2,000kg x 20m/s)
(100,000) + (40,000) = 140,000