7. A proton moving at 5.0 . 10' m/s enters a series of charged parallel plates. What is the impact speed on the last plate? 10 -50 x 10' m/5 + ) - proton 0 V - 2090 V -5000 V A. 9. 1 . 105 m/s B. 9.8 . 105 m/s C. 1. 1 . 105 m/s D. 1.3 . 10'' m/s 8. A proton, accelerated from rest through a potential difference of 1.2 . 10* V, is directed at a fixed 5.0x10 C charge. + ) 5.0*10 ' C fixed 12 000 V QV (Diagram not to scale.) a) What is the speed of the proton as it leaves the parallel plates? (4 marks) b) What is the distance d from the fixed charge when the proton is stopped