SOLUTION: There is a railroad track that is 5 km long and the rails are one metre apart. A child ties a can to a dog's tail and it starts running down the track, the dog's initial speed is o

Question 1132127: There is a railroad track that is 5 km long and the rails are one metre apart. A child ties a can to a dog's tail and it starts running down the track, the dog's initial speed is one metre per second. the dog speeds up by one metre per second every time it hears the can hit a rail. assuming the can hits all the rails, what is the dog's speed at the end of the 5 km?

Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!

The rails are what the train's wheels ride on. The cross pieces are ties, not rails.

5km = 5000m = 5000 ties.

That is, 5000 ties after the one at the beginning of the 5km track.

If the dog starts at 1m/sec and increases by 1m/sec every meter for 5000 meters, his speed at the end of the 5000m will be 5001 m/sec.
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