In an electron microscope, there is an electron gun that contains two charged metallic plates 2.75 cm apart. An electric force accelerates each electron in the beam from rest to 8.90% of the speed of light over this distance. (Ignore the effects of relativity in your calculations.)
(a) Determine the kinetic energy of the electron as it leaves the electron gun. Electrons carry this energy to a phosphorescent viewing screen where the microscope's image is formed, making it glow.
(b) For an electron passing between the plates in the electron gun, determine the magnitude of the constant electric force acting on the electron.
(c) Determine the acceleration of the electron.
(d) Determine the time interval the electron spends between the plates.
The Attempt at a Solution
So I know you can find kinetic energy with the equation k=1/2mv2 but what would I use for the mass? I assume you would just have to calculate out the velocity from the percentage of the speed of light correct? I have no idea what to do for b) and d). And for c) I assume you would do delta velocity over delta time but what would the time be?