An object moving in a straight line changes its velocity uniformly from 2m/s to 4 m/s over a distance of 12 m. what was its acceleration? (a) 0.5 m/s^2 (b) 1 m/s^2 (c) 2 m/s^2 (d) 3 m/s^2

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