Question
A North-going Zak has a mass of 50 kg and is traveling at 4 m/s. A South -going Zak has a mass of 40 kg and is traveling at 5 m/s. If they get stuck together after the collision, what is their final velocity?
Answers
system momentum is conserved
they have equal and opposite momenta before the collision
they have equal and opposite momenta before the collision