A proton, initially at rest, moved from a place where the electric potential is

Question

A proton, initially at rest, moved from a place where the electric potential is 500 V to a place where the electric potential is 0 V. What is the proton's initial kinetic energy, initial electric potential energy, final kinetic energy, and final electric potential energy? ( A is not the right choice, I have tried it and it is wrong )

A) initial kinetic energy=0 J, initial potential energy=500 J, final kinetic energy=500 J, and final potential energy=0J.

B) initial kinetic energy=0 J, initial potential energy=0 J, final kinetic energy=500 J, and final potential energy=500J.

C) initial kinetic energy=0 J, initial potential energy=500 eV, final kinetic energy=500 eV, and final potential energy=0J

D) initial kinetic energy=0 J, initial potential energy=-500 eV, final kinetic energy=500 J, and final potential energy=0J

A) initial kinetic energy=0 J, initial potential energy=500 J, final kinetic energy=500 J, and final potential energy=0J.

B) initial kinetic energy=0 J, initial potential energy=0 J, final kinetic energy=500 J, and final potential energy=500J.

C) initial kinetic energy=0 J, initial potential energy=500 eV, final kinetic energy=500 eV, and final potential energy=0J

D) initial kinetic energy=0 J, initial potential energy=-500 eV, final kinetic energy=500 J, and final potential energy=0J

Explanation / Answer

.

the energy of isolated system is conserved , Ei=Ef

                                                             Ui+Ki=Uf+Kf

Ui=qV=500 eV

Ki=0

Uf=0

Kf=500 eV

Ans C

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