1. The problem statement, all variables and given/known data Two people, one of mass 75kg and the other of mass 60kg, sit in a rowboat of mass 80kg. With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 3.2m apart from each other, exchange seats. How far will the boat move? and in what direction will the boat move? 2. Relevant equations xcm=x1m1+x2m2+xbmb/(m1+m2+mb) 3. The attempt at a solution m1=75kg person initially on left end of boat. m2=60kg person initially on right end of boat. mb=80kg boat my origin is at the left end of the boat and the 75kg person is initially there. xcm=x1m1+x2m2+xbmb/(m1+m2+mb) xcm=(0)(75kg) + (3.2)(60kg) + (1.6)(80kg)/(75kg+60kg+80kg) xcm= 1.4883m Now for my final(center of mass doesn't move) 1.4883m=x1m1+ x2m2 +xbmb/(m1+m2+mb) 1.4883m= (3.2m)(75kg) + (0)(60kg) + xb(80kg)/(215kg) xb(final) = 1.004375m xb(final)-xb(initial) 1.004375m- 1.4883m=-.4839m Is this correct? Thanks!