How is it that everything around us including ourselves came from nothing

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

In science and physics what is the standard unit of measure for speed?

Me ! since green bounces off red, this must be collision a.elastic b.explosion c.inelastic