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?