The diagram below depicts two cases in which a 0.2 kg ball strikes falls
and strikes the ground. Case A: the ball is moving downward at 5 m/s
when it hits the ground then rebounds upward at 2 m/s. Case B: The ball
moving downward at 5 m/s when it hits the ground and stops
immediately. Calculate the momentum change of the ball for each case.
Then, explain which ball, if any, experiences the greater force. Show all of
your work."

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 -

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.

This did i unseated, sorry