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Calculate the speed at which a 0.723-kg object has the same momentum as a 1.30-kg object...

Calculate the speed at which a 0.723-kg object has the same momentum as a 1.30-kg object that is moving 0.515c.

I found another version of this on Chegg, but was unable to follow the steps clearly, so please be clear and help me understand how to do this. Have a test on this concept tomorrow. I know the correct answer is 0.734c, I just don't understand how to do future problems like this one.

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