I would probably use kilograms.
Newtons.
pounds
grams
Try grams
kilo-newtons.
That depends what aspect of the adult you want to measure: the adult's height, mass, weight, volume, albedo, intelligence (no SI unit for that!), etc.
Pounds
A millinewton. NOT a gram, which a measure of mass, not of weight.
grams
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Newtons.
pounds
The most appropriate unit of weight for a computer would be in pounds.
ounces
most likely in grams
Grams.
grams