On a roller coaster, there is a motor driven chain that the cars attach to that pull the car up the first hill. what would eventually happen if the cars were allowed to roll down the first hill and no further mechanical energy were added?

Consider two regions of space containing a static electric field, region a and region b. in region a the equipotential lines are more closely spaced than those in region b. what can be said about the relative strength of the electric field in the two regions? a) the electric field in region a is stronger th