1. PAL 1) When the two carts are at rest a)what is the center of mass speed? b) what is the total momentum? After they push apart c) what is the center of mass speed? d) what is the total momentum?

2. PAL 2 ) When one cart is moving and the other is at rest a)what is the center of mass speed? (is it zero? equal to moving object’s speed? greater? less? After they stick together b ) what is the center of mass speed? 3)If two equal-mass carts approach with equal speed a)what is the center of mass speed? b) how will they move after they stick together?

3. PAL 3 ) When one cart is moving with a velocity vector in the first quadrant, and the other is at rest, a)in what quadrant is the center of mass velocity? After they collide, one moves along the -x-axis b ) in what quadrant is the other velocity?