yards or meters
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metres
a centimeter
Kilometers
Its height (above mean sea level): metres Its length: kilometres - or metres if it is a really short trail.
You can measure any object you like using tonnes, however, unless the object is a massive one like an Elephant or a Bus, there is likely to be lots of zeros after (or before) a decimal point which would make it not a very sensible unit to measure the mass of the object.