A proton is projected in the positive x-direction into the region of uniform electric field E = -5.00 x 105 i N/C at t = 0. The proton travels 6.20 cm as it comes to rest.
(i) Find out the acceleration of the proton.
(ii) Find out the initial speed of the proton.
(iii) Find out the time interval over which the proton comes to rest.