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## Homework Statement

a uranium atom traveling at speed 4 *

## Homework Equations

The answer is about 8*10^4 m/s

But, i tried many times and failed.

## The Attempt at a Solution

MY thought is that the speed of uranium atom after collision should be the same but in different direction, which means the momentum of hydrogen after collision is 2*p1(p1 is uranium momentum before collision). and use this to calculate the speed by plugging into the formula k = p^2 / 2m