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The official answer is C.

Why not A? If I add a horizontal component of velocity towards left, why would the path become curved?

  • $\begingroup$ Note: physics.stackexchange.com/q/692246 does not fully answer my question $\endgroup$ Jun 26, 2022 at 8:12
  • $\begingroup$ I think I understand that my problem is that I am treating a travelling longitudinal wave somewhat like a single travelling particle. However, I still can’t solve this. $\endgroup$ Jun 26, 2022 at 9:00