1. Sometimes thinking too much can destroy your momentum. -Tom Watson

2. Two blocks are connected by a compressed spring, held with a string. They move at speed v over an icy pond. After the string is cut, block A stops. What is the speed of block B, if m A =m B ? A] 0B] v C] 2vD] 3v E] none of these What is the speed of block B, if m A = 2m B ? D

3. If m A = 2m B, what is v A /v B in the “center of mass reference frame”? A] 1/2B] 1 C] 2D] 4 E] none of these In the center of mass reference frame shown, what is the velocity of m B after the collision, if it is completely elastic? A] 0B] v A to the right C] v A leftD] v B to the right E] v B left