Oh, dude, a common household object that's 0.5 meters long? That's like asking me to find a needle in a haystack... but hey, I got this! A standard ruler is about 0.5 meters long. So next time you need to measure something, just whip out that bad boy and go to town.
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The answer has to be a broom or mop.
A yard stick is approximately a meter long (actually 0.9144 meters). Also, a baseball bat is usually one meter long.
A lock on a door knob.
5 meters long= possiblily a bus, limosine.... Prussia's.
An ordinary door.