Two people, one of mass 70 and the other of mass 65 , sit in a rowboat of mass 78 . With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 3.5 apart from each other, now exchange seats.

Question

Two people, one of mass 70  and the other of mass 65 , sit in a rowboat of mass 78 . With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 3.5  apart from each other, now exchange seats.

drwls · Answer

Numbers without units are useless in physics. You should know that by now.