What type of energy does friction produce?

Gunpowder residue is most likely to show up where on a shooters hands

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a. the kinetic energy increases. b.the kinetic energy decreases. c.the kinetic energy remains the same. d.the kinetic energy is always zero.

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?