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Grade: 12 

                        
A wooden plank of mass 20kg is resting on a smooth horizontal floor.A man of mass 60kg starts moving from one end of the plank to the other end.The length of the plank is 10m.Find the displacement of the plank over the floor when the man reaches the other end of the plank.
3 years ago

Answers : (2)

Sony yadav
13 Points 
							7.5m
2 years ago
Roshan Shah
16 Points 
							
Answer is 7.5m 
Use simple trick S : (m/M+m)*L
Where m: mass of wooden planck
            M : mass of man
            L: boat length
Now Net displacement of boat = 10-S
2 years ago
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