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How fast does something need to move to be set on fire?

15,611
10,564
I've seen 4km/s for meteors and stuff like that but i think there were lower values for other stuff.

I have a feat where a lady throws a bouquet so fast it is set on fire

how fast is it?
 
That's for clothes catching fire, which they do at lower temperatures than our bodies, so i think mach 5 is still the norm for it.

However, those are flowers in the feat so i think you'd need to calc this separately
 
That's for clothes catching fire, which they do at lower temperatures than our bodies, so i think mach 5 is still the norm for it.

However, those are flowers in the feat so i think you'd need to calc this separately
and how the heck would i do that now huh?
That's what i am asking mate.
 
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