Two particles, each of mass m, are moving at a speed v = 0.866c directly toward one another. After the head-on collision, all that remains is a new particle with mass M. What is the mass of this new particle?
Added by Ruben T.
Step 1
Before the collision, the total momentum of the system is mv + (-mv) = 0 (since the two particles are moving in opposite directions). After the collision, the total momentum is also 0 (since the new particle is at rest). Show more…
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