Question

Hey, I need help to study for finals: I know one of the questions (our teacher gave us) is: there is a 4kg mass traveling at 4 m/s to the right on a frictionless surface that collides with a block of 5kg. The 5kg block is moving at 2 m/s. They stick to each other after the collision. What is the velocity after the collision? Can you help me?

Thanks!
which direction is the 5kg block moving?

system momentum is conserved
@R_scott left

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