Vf=vi−gt if the time is 2 seconds

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

answer: i pick a

explanation:

because if the tool that you are using is not balanced it there would be false mass.