Final answer:
The proper unit for all types of energy is the joule (J), which is equivalent to a kilogram meter squared per second squared (kg·m²/s²) and also to one Newton meter. option a is correct.
Step-by-step explanation:
The proper unit used for all types of energy is the joule (J). Energy, whether it is kinetic, potential, thermal, radiant, or chemical, can all be measured in joules.
The joule is defined in basic SI units as a kilogram meter squared per second squared (kg·m²/s²), which aligns with the units derived from the equation for kinetic energy (KE = 1/2 mv²). This reveals that the energy of any system is effectively the capacity to do work or to produce heat.
A joule is also equivalent to one Newton meter, since work and kinetic energy share the same units. For practical purposes, when larger amounts of energy are being considered, chemists and other scientists often express energy in kilojoules (1 kJ = 1000 J).