A string is vibrating between two posts as shown above. Students are to determine the speed of the wave within this string. They have already measured the amount of time necessary for the wave to oscillate up and down. The students must also take what other measurements to determine the speed of the wave?
A. The distance between the two posts.
B. The amplitude of the wave
C. The tension in the string
D. The amplitude of the wave and the tension in the string
E. The distance between the two posts, the amplitude of the wave, and the tension in the string
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