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No, the color of a mirror does not affect it's reflection of light.
They can alter the location or orientation of the figures but do not affect their shape or size.
If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.
That will depend on lots of things; mainly, from how high it falls, what's its initial velocity, as well as its shape and size (which will affect air resistance).
The same as multiplying any other function by a negative number - after multiplying, positive numbers will become negative numbers, and vice versa.