An observer at the origin of his reference frame (o) notes two flashes of light, a and b, spatially separated by 2400m occur along the positive x-axis of his reference frame. the a flash occurs first, followed after 5.0 micro-s by the b flash. a second observer (o') sees the two flashes at the same of the speed of light c)?

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate