Two identical spheres move in opposite directions with speeds $v_1$ and $v_2$ and pass behind an opaque screen, 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 $v_1$ and $v_2$ and pass behind an opaque screen, where they may either cross without touching (Event $1$) or make an elastic head-on collision (Event $2$)
- A
We can never make out which event has occurred
- B
We cannot make out which event has occurred only if $v_1 = v_2$
- C
We can always make out which event has occurred
- D
We can make out which event has occurred only if $v_1 = v_2$
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