Im pretty sure kilograms is appropriate
kg. (kilograms), or tons (thousands of kg.).
-- "20 kg" is the child's mass, not her weight.-- The car's mass doesn't matter.The child's momentum is (M V) = (20) (10) = 200 kilogram-meters per second.
Momentum = mass * velocity. If both cars have the same mass, then the faster one will have more momentum. Probably the slow car doesn't weigh 5 times as much as the fast one, so the fast one most likely has more momentum.
Tons for a rough and ready answer, kilograms for a more accurate answer.
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That depends what aspect of the car you want to measure: for example its length, volume, mass, weight, color, etc.
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