Follow this link to read a short section from an online physics book. http://www.physicsclassroom.com/Class/momentum/
You should read parts a, b, and c from Lesson 1: The Impulse-Momentum Change Theorem. Try answering the questions as you go.
Alternately you could read section 9.1 from the textbook (pp. 199-206)
Then do the two problems from the new assignment at the UT site. It's due at 10:00 Wednesday evening. (Jan 4)
