The stretched length of a spring is 428 m a ribbon is tied, Ask an Expert

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The stretched length of a spring is 4.28 m. A ribbon is tied aroundthe spring at a point near its center. A pulse created at one endof the spring makes 13 back-and-forth trips along the spring in6.59 s.

(a) With what frequency does the ribbon go up anddown?
(b) With what speed does the pulse travel alongthe spring?

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