A blue-ball of mas m=3 kg is thrown with an initial speed 0 m/s, at an angle of θ=32.4° above the horizontal. At the same time, a black-ball of mass m=2 kg is dropped from rest. When blue-ball starts the projectile motion, the black-ball is 19.62 m above the ground and starts the free-fall. After 1.3 s later, these two balls stick together after colliding in the air (no air resistance), in the case of perfectly inelastic collision. a) Find the momentum vector after perfectly inelastic collision.
b) When and where do they hit the ground after perfectly inelastic collision?.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -