A uniform electric field of magnitude 200 N/C is in the x-direction. A point charge Q=3x10^-6 C initially at rest at the origin is realised
1) What is the potential difference V(4m)-V(0)
2) What is the kinetic energy of the charge when it is at x=4m?
3) What is the change in potential energy of the charge form x=0 to x=4? (Do i use the formula Change in PE= q (change in V)