Two trolleys meet. Whatever happens in the crash, the total momentum, mass times velocity added up, is the same after as before. Velocities to the right count as positive, to the left as negative. When they stick together they share one final velocity, found by dividing the total momentum by the total mass.
MissionPredict which way the stuck pair moves, then run the crash.Round 1Streak 0Best 0
After a sticky collision the pair moves:
total momentum before2 kg m/s
total momentum after2 kg m/s
momentum is conserved: the total before equals the total after.