Calculating kinetic energy of an emitted electron [ENDORSED]

[Toru Fiberesima 1L]

I'm wondering how you go about calculating the kinetic energy of an ejected electron when you are only given the speed at which it is ejected. What would you would put for mass of electron in the KE equation.

Thanks

[ErinKim1I]

the mass of an electron is a constant (9.11x 10^-31 kg).

[LilianKhosravi_1H]

yes the mass is a constant and is on the cover page of the tests so you don't have to worry about memorizing it.

[danielruiz1G]

The mass of an electron is a constant that you use in the equation for kinetic energy the only other way that you have to worry about mass is when it's asking for the energy of a molecule or atom where you would them have to use the periodic table to find its mass.