A uniform electric field of magnitude 15.0 N/C is directed parallel to the positive x-direction. A proton is at the origin (x = 0, y = 0) at time t = 0 when it is moving with a velocity of 5.0 x 10^4 m/s in the positive y-direction. Ignore and non-electric forces. At some particular later time, it has an x-coordinate of 4.0m.
a.) What is the acceleration (magnitude and direction) of the proton?
b.) What is the y-component of the velocity of the proton at the later time?