In chemistry, the SI unit of energy is the Joule, whose fundamental units are Kg·m²/s²
Kinetic energy is found using the equation KE = 1/2 MV², where M= mass (in Kg) and V= velocity (in m/s)....be sure to always have the units correct before calculating.
From the equation, mass is proportional to KE...if you double the mass in a system, the KE would also double.
However, KE is proportional to the square of the velocity in a system...if you double the velocity in a system, the KE increases by a factor of 4 (2²).
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