45. Mass of moving electron?

Q. The mass of electron moving with velocity of light is:

Q. The dynamic mass of electron having rest mass $m_0$ and moving with speed $0.8c$ is :

Q. The ratio of the deBroglie wave length for the electron and proton moving with same velocity is:

Q. A moving electron has $2.8\times {10}^{-25}J$ of kinetic energy. Its wavelength is:
(Mass of electron $=9.1\times {10}^{-31}kg$).