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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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The problem is solved giving all necessary mathematical steps. It will enable you to do similar problems yourself.

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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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