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Homework Statement
A lorry of mass 20,000kg is traveling at 20.0m/s towards a car of mass 900kg traveling at 30m/s towards the lorry. What is the magnitude of the total momentum?
Homework Equations
m1u1+m2u2=p1
Not sure about any others :\
The Attempt at a Solution
The lorry has a momentum of 400,000Ns in the positive direction and the car has a momentum of 27000Ns in the negative direction but this is before impact. Not sure how to go about this, any help would be appreciated.