ANSWER:
2 Factors: Mass and Speed.
2 Units: Kilograms (kg) and Meters per second (m/s), for KE is Joules (J).
Speed is the most influential factor.
Explanation:
The kinetic energy is given by the following formula:
Therefore, the two factors are mass and speed.
The units of mass and speed in the international system of units are kilograms and meters per second. The units of kinetic energy are joules.
The most important factor is the speed, since being squared, it means that it influences the kinetic energy twice while the mass only influences it once.
Speed is the most influential factor.