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    Working with elastic collision

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    A body of 2kg mass makes an elastic collision with another body at rest and afterwards, continues to move in the original direction but with one fourth of its original speed. What is the mass of the struck body?

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    https://brainmass.com/physics/work/elastic-collision-unknown-mass-7484

    Solution Preview

    Let m be the mass of the struck body.

    Initial momentum = mass x velocity = 2 u

    Let v be the velocity after collision

    Then 2u = ...

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