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Right, I think he's got the right answer.
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If I only told you that I jumped and landed on the shore,
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that's not enough to predict how fast the boat is moving.
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But if I told you my velocity when I was airborne,
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then of course I know
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my momentum and you can find the boat momentum
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and that's the velocity it will retain forever.
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So, you need more information than
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simply saying, "I jumped to the shore."
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It depends with what velocity
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I left the boat and landed on the ground.
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If I leap really hard,