Hi, Can someone please help me with this question: In a physics lab, a rope is observed to make 240 complete vibrational cycles in 15s. the length of the rope is 2.8m and the measurements are made for the 6th harmonic (with six equal length sections). Determine the speed of the waves in the rope. V = 0.0625 x 2.8 = 0.175 m/s This is what I did- my teacher said to find the wavelength of one wave- which wouldn't be 2.8

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.