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the momentum of Car R is
(1000kg)(20m/s)=20,000Ns
the momentum of Car S is
(1200kg)(-10m/s)=-12,000Ns (but in the opposite direction of R so we will call this direction negative)
take the sum of the two momenta to get 8,000Ns
the new momentum is 8,000Ns and the mass of the system is 2200kg. so plug this into the momentum equation
p=mv
8000Ns=(2200kg)(v)
v=3.636m/s
(1000kg)(20m/s)=20,000Ns
the momentum of Car S is
(1200kg)(-10m/s)=-12,000Ns (but in the opposite direction of R so we will call this direction negative)
take the sum of the two momenta to get 8,000Ns
the new momentum is 8,000Ns and the mass of the system is 2200kg. so plug this into the momentum equation
p=mv
8000Ns=(2200kg)(v)
v=3.636m/s
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