figure 8-19 gives the potential energy function of a particle. (a) rank regions ab, bc, cd, and de according to the magnitude of the force on the particle, greatest first. what value must the mechanical energy emec of the particle not exceed if the particle is to be (b) trapped in the potential well at the left, (c) trapped in the potential well at the right, and (d) able to move between the two potential wells but not to the right of point h? for the situation of (d), in which of regions bc, de, and fg will the particle have (e) the greatest kinetic energy and (f) the least speed?