A wooden plank of mass 20 kg and length 10 m is resting on a smooth horizontal floor. A man of mass 60 kg starts moving from one end of the plank to the other end. Find the magnitude of displacement of the plank over the floor when the man reaches the other end of the plank.
A. 7.5 m
B. 5 m
C. 12.5 m
D. 2.5 m
