A spring with a length of 6.8 meters is attached at one end to a wall. The spring is closed at one end. The spring is moved back and forth at the free end so that a standing wave with 6 nodes are produced. If the free end is moved back and forth along the floor 21 times in 6.0 s, determine the speed of the wave (in m s-1). Frequency of the object does not change the wave speed



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