y (cm) 1=0 10 K 2 3 x (m) y (cm) t = 0.200 s 10 5 O 2 3 x (m) The pulse travels to the right on a string whose ends at x = 0 and x= 4.00 m are both fixed in place. Imagine a reflected pulse that begins to move onto the string at an endpoint at the same time the incident pulse reaches that endpoint. The superposition of the incident and reflected as it does at t= 0? pulses gives the shape of the string. When is the first time for t> 0 that the string looks exactly