A hula hoop is rolling along the ground with a translational speed of 26 ft/s. It rolls up a hill that is 16 ft high. Determine
whether the hoop makes it to the top\of the hill. If the hoop makes it to the top, what is its translational speed at the top? If the hoop does not make it to the top, how far vertically up does it rise before stopping? (Hint: A hula hoop is a uniform ring. Apply energy conservation for a rolling object.)
A negative charge, if free to move in an electric field, will move from a low potential point to a high potential point. To move a positive charge against the electric field, work has to be done by you or a force external to the field.