A proton, moving with a velocity of vi i ^, collides
Chapter 9, Problem 40(choose chapter or problem)
A proton, moving with a velocity of vi i ^, collides elastically with another proton that is initially at rest. Assuming that the two protons have equal speeds after the collision, find (a) the speed of each proton after the collision in terms of vi and (b) the direction of the velocity vectors after the collision
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