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## Homework Statement

A dog with mass 11 kg stands still in a boat with mass 45 kg. the dog is 20 meters from the shore. It then walks 8 meters in the boat towards the shore. how far is the dog from the hore aftter this?

## Homework Equations

center of mass equation

## The Attempt at a Solution

lets say the dog stands on the boats center of mass. the center of mass is then 0. Now the dog walks 8 meters 1 direction. then the center of mass of the boat has to travel he other direction for the total center of mass to stay the same. So:

11kg*8m+45kg*xm=0

This gives me that boat has traveled 1.95 meters in the opposite direction. So the dog has traveled (8-1.95) meters closer to the shore which gives me that the dog is 13.9 meters away from the shore. The blueprint says 13.6. I just wanna know if its me or the blueprint who is wrong here