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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.
The number 1.89 x 10³ has three significant figures. The digits 1, 8, and 9 are all non-zero digits, which are counted as significant. The scientific notation does not affect the number of significant figures in the coefficient.
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).