Debunking the Myth: The Truth About Black Holes and Accelerated Particles

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i found this on a website , but I am sure I've read other stuff saying a black hole won't form ?

"If a particle is accelerated to a certain velocity near that of light, it gains enough mass to collapse into a black hole, making it impossible for observers to make statements about its velocity".

would you regard this as a true statement ?

is there any theories at the moment that speculate what form mass gained by aceleration takes ie some type of particle ?
 
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