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physics help

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a 3.5 kg dog stands on a 21 kg flatboat at distance D = 6.1 m from the shore. It walks 2.3 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore.

I thought i have the right equation but my answer is not correct.

  • physics help -

    wouldn't the dog move 2.3(3.5/21) m toward the shore?

  • physics help -

    then you would subtract the overall distance and the answer above? right?

  • physics help -

    remember that the boat moves as well...the dog is a system and the boat is a system

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