A mass 3m collides head-on with a mass m. Before the collision the masses are moving directly toward one another with the same speed v0. After the collision, the mass 3m is moving in its original direction at speed v0/2. What is the speed v of the mass m after the collision

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.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

your answer is, orbit around the nucleus