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What goes in the AFTER picture of an event?

Which of these is an elastic collision?

What is the median survival time for a typical dog with high grade lymphoma treated with the CHOP chemotherapy protocol?

A 0.008 [kg] bullet is fired from a 2 [kg] gun and leaves the barrel at 800 [m/s]. Both were at rest beforehand. With what velocity does the gun recoil?

Why do we choose a positive direction before adding any momenta up?

A 3 [kg] object sitting at rest breaks into two pieces. Which Cop setup is right?

In an elastic collision between two objects, the mass m1 shows up on both sides of the Cop equation. Why?

A system’s total momentum is 0 [kg m/s]. What does that tell us about the objects in it?

Why does the Cop equation work on an elastic collision without any extra terms for the bounce?