Ajogger accelerates at a constant rate of 1.20 m/s^2 for 3.00 seconds. if her initial speed was 2.50 m/s, find her speed after those 3 seconds of acceleration.

Using:  v = u + at, 
u = initial speed = 2.50 m/s
a = acceleration = 1.2 m/s^2
t = time = 3.00 s

v = 2.5 + 1.2*3
v = 2.5 +3.6
v = 6.1

Her speed after 3s is 6.10 m/s.

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 -