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A lab worker is watching a bunch of particles zing through her particle accelerator. She observes...

A lab worker is watching a bunch of particles zing through her particle accelerator. She observes one particle that's moving at 61% of the speed of light for its whole life, and she sees that it travels a certain distance before decaying.

How fast would a second particle need to be traveling for its entire life if the lab worker is to see this second particle travel twice as far as the first? Assume all particles in this problem would have the same lifetime on earth.

___ m/s

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