Which factor provides kinetic energy of an electron?

Kinetic energy is another name for scalar energy. Kinetic energy is provided by the vector energy cmV=cP, the momentum energy. Momentum is a vector and Momentum energy cP is also a vector, a vector energy.

This Momentum Energy gives the velocity V and speed v and thus the "kinetic energy".

The electron vector energy is cmV=cP and and the scalar energy is vp ! it is clear that te sclar energy vp=mv2 is much smaller than the vector energy cVm.

the so-called kinetic energy is vp/2 = 1/2 mv2.

kinetic energy is a product of the vector energy cmV, no Velocity , no kinetic energy.