1. The problem statement, all variables and given/known data a 90 kg block 1 and 360 kg block 2 are on opposite ends of a 300 kg slab of length 12.0 m which is on a frozen lake. assume no friction between slab and ice. block 2 moves 4.0 m towards block 1 while block 1 moves 2.50 m towards block 2. how far does the slab move? 2. Relevant equations c.m.= (Ʃmr)/Ʃm 3. The attempt at a solution i am kind of lost on how to approach the problem. i know the center of mass does not change because there are only internal forces. i dont know how the motion of the blocks relates to the motion of the slab. any help would be appreciated.