Two identical spheres move in opposite directions with speeds v_(1) and v_(2) and pass behind an opaquescreen, where they may either cross without touching (Event 1) or make an elastic head-on collision (event 2)

Two identical spheres move in opposite directions with speeds v_(1) an

1.	Two identical spheres move in opposite directions with speeds v_(1) and v_(2) and pass behind an opaquescreen, where they may either cross without touching (Event 1) or make an elastic head-on collision (event 2)
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