Your comment made me try this out on wolfram alpha. Kinetic energy of 1 gram with velocity of 0.1 C is 452.78 gigajoules. Energy of the Hiroshima bomb is 6.3x10^13 joules. It would take 139.14 grams of matter at a velocity of 0.1 C to have the kinetic energy equivalent to the energy released by the bomb. So wow, yes, stopping even a small amount of stuff at those speeds is no joke.
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