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12th July 2007 | 10:18

#56 (permalink)

NickLappos

Joined: Apr 2003

Posts: 3,012

Likes: 1

From: USA

Jiff,
You are getting close:

The boat moves forward as the rock moves aft, then the boat moves aft as the rock moves forward. The net gain is zero. What about zero intrigues you?

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