Mathematics · Relativity
Consider a relativistic particle of rest mass 2m moving with a speed v along the x direction. It collides with another relativistic particle of rest mass m moving with the same speed but in the opposite direction. These two particles coalesce to form one particle whose rest mass M is (where β = v/c and c is the speed of light):
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- 1m4 √1 - β22 - β2
- 2m2 √9 - β22 - β2
- 32m √3 - β21 - β2
- 4m √9 - β21 - β2✓
Correct answer
m √9 - β21 - β2
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