a proton has a speed 4.5*10^5 m/s at a point where electrical potential is 900V. it moves through a point where the electric potential is 500V. proton mass 1.67*10^-27kg, charge of an electron e=1.6*10^-19 C.
A) find the kenetic energy of proton at first point.
B) the potential energy of the proton at first point.
C) the potential energy of the proton at the second point.
D) the kinetic energy of the protonat second point.
E) the speed of the proton at second point.