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Homework Statement
A 0.010-kg positively-charged particle is accelerated by a uniform electric field directed to the right. The object accelerates from 5.0 to 15.0 m/s while traveling a distance of 0.10 m.
Suppose the particle is moved by an external force a distance of 0.10 m against the field. What is the change in electric potential energy of the particle? Is the change an increase or a decrease?
Homework Equations
DeltaU = -W
W=fd
The Attempt at a Solution
I know that Fext must be greater than Fel, but how much greater?
W=fd, distance is .10m. How do I determine the change in EPE, specifically calculating the amount of work neccesary?