Time for electron to travel between parallel plates 9 cm apart

[wayneinsane]

Two parallel plates are 9.0 cm apart. The bottom plate is charged positively and the top plate is charged negatively, producing a uniform electric field of 3.0 × 104 N/C in the region between the plates. What is the time required for an electron, which starts at rest at the upper plate, to reach the lower plate? (Assume a vacuum exists between the plates.)

 

[Delphi51]

The electric field causes a force on the electron, which causes it to accelerate. You will need the formula for each "causes". Also, accelerated motion formulas to find the time once you know the acceleration. Have a go at it!