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The first question pertaining to this was the speed when it hits the opposing wall. I found the correct answer to be 8.152m/s. Then it wants to know the angle that it hits the wall. For where the particle left the first wall, I made a right triangle and found the angle to be 49.447 degrees.

I don't know how to answer the question. I assumed that the answer was to be in respect to the positive x axis so I did 180-49.447 = 130.553 and that was wrong. Are they asking for the angle relative to the opposing wall? I'm so confused.