A certain moving electron has a kinetic energy

Question

of 0.991 × 10−19 J.
Calculate the speed necessary for the electron to have this energy. The mass of an
electron is 9.109 × 10−31 kg.
Answer in units of m/s.
answer is ?

Answer 1

K.E. = 1/2 m v^2 ... v = √(2 K.E. / m)