To study the properties of various particles, you can accelerate the particles with electric flelds. A positron is a particle with the same mass as an electron but the opposite charge (+e). Express your answer in vector form. Do not enter units in your expression (a) If a positron is accelerated by a constant electric field E - (320 1 - 125j-195 kN/C, find the acceleration of the positron (32-125j-15d th m/s2 (b) Assuming the positron started from rest, find the velocity of the positron 8.75 x 10-9 s later. m/s