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) 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

Given
proton of charge q moving from potential at 500 V to 0 V

we know that the potential energy is U = v*q

   V is potential and q is charge

so the initial potential energy is 500 J

   final potential enegy at 0 v is 0 J

the initial kinetic energy is zero J and

the final kinetic energy is 500 J

answer is option A)

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