(Figure 1) (a) is a graph of the horizontal and vertical positions for two wave pulses on a string at the time t = 0 8. Both pulses are moving to the right at 1.0 m/s. The string has a fixed end on the right side at ir - 8.0 m. Is graph (a) a snapshot graph or a history graph? history graph O snapshot graph Submit Request Answer Part B Graph (b) is the same string, but at a later time. At what time was graph (b) taken? HINT: Think about what happens to the two pulses when (and after) they encounter the fixed end. Drawing pictures is helpful. Notice that the pulses both move at 1.0 m/s. Express your answer with the appropriate units. >View Available Hint(s) t = Value Units Submit Provide Feedback Next > Figure 1 of 1 > D(cm) at 1 = 0s 3- N x(m) 1 2 3 10 mis D (cm)