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The SI unit for mass is always kg, which can be confusing for measuring objects with very small mass (like electrons). Just know that in equations, like 1/2mv^2 for kinetic energy, the mass must always be represented in kg.
Just be aware that most of your SI units are in kilograms, because depending on the question, they may ask for an answer in grams. This won't always be the case, but it's good to be aware of the units in different measurements like joules and watts, it makes conversions much more clear.
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