A sprinter crosses the finish line of a race. The roar of the crowd in front approaches her at a speed of 352 m/s . The roar from the crowd behind her approaches at 336 m/s . v PartA What is the speed of the sound? Express your answer with the appropriate units. m(')]? m v = |34 S LS8 efq i Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining v PartA You are standing at z = 7.0 km. Lightning bolt 1 atz = 0 km and lightning bolt 2 at z = 13.0 km. Both flashes reach your eye at the same time. Your assistant is standing at = = 2.5 km. Does your assistant see the flashes at the same time? yes no Previous Answers + Correct v PartB If the answer to part a is no, which flash does she see first? Lightning bolt 1 Lightning bolt 2 Previous Answers Correct v PartC If your assistant didn't see the flashes at the same time, what is the time difference between the two flashes? Express your answer in microseconds. B o 0 0 om o t,t,=| =510 s