2. A 50 g piece of clay moving at 80 m/s hits a stone, at rest, and sticks to it. The clay momentum must change by: A. 80 Ns B. 40 Ns C. neither A nor B D. more data is needed to answer Explain your reasoning. Give your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?

Fig: 1