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The figure shows a snapshot graph of a wave traveling to the right along a string at 45 m/s. Find velocity at 1, 2, and 3

I don't know how to approach this problem since I thought the speed of a wave traveled the same speed on all of the string but it tells me that 45m/s is wrong.

I don't know how to approach this problem since I thought the speed of a wave traveled the same speed on all of the string but it tells me that 45m/s is wrong.