Anions are . a
negative ions formed by gaining electrons
b
positive ions formed by losing electrons
c
negative ions formed by losing electrons
d
positive ions formed by gaining electrons

pls help awnser doing a major grade test

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

What is the coefficient of kinetic friction μk between the block and the tabletop?