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6. Naomi and Briana were making a standing wave pattern with their slinky in the hallway. Elizabeth measured that they were seated 4.0 m apart

6. Naomi and Briana were making a standing wave pattern with their slinky in the hallway. Elizabeth measured that they were seated 4.0 m apart and saw that there were two nodal points between them. Naomi moved her hand back and forth 21 times in 35 seconds while Briana kept her end of the slinky in a fixed position. What was the speed of their waves

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