1. A 3 kg mass hits a stationary mass of 9 kg and sticks. What is the change in entropy? So, I figure that I will need to [tex]\Delta[/tex]S = [tex]\Delta[/tex]Q[tex]/[/tex]T. However, I don't know the heat or the temperature of this reaction, so this couldn't possibly be the way to evaluate. So, I think I could use S = k ln (number of microstates) and find the difference between the initial and final values of S. However, how would I calculate the number of microstates for this system?