Amotorcycle and its driver has a mass of 145 kg. answer the following questions about it, using correct units.

a. the motorcycle has a speed of 25.g m/s. what is the kinetic energy of the motorcycle?

b. the motorcycle climbs a ramp. how much gravitational potential energy has the motorcycle gained when it reaches a height of 3.5 m?

c. the motorcycle jumps off the ramp at a speed of 28 m/s at a height of 4 m.
what is the total mechanical energy of the motorcycle at this point?

B. a circuit. i think

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 -