Janice is roller skating at a constant speed away from her house. the first half of the street is flat, but the second half has a steep upward hill. janice moves more slowly as she skates up the hil

Now this just because of decrease in acceleration while moving in upward direction. Just because she faced the upward hill and to accelerate at the same rate while moving upward always need some upward force but as janice was not applying any sort of large amount of force but however she was skating she faced faced the decrease in acceleration.

Explanation:

Due to decrease in acceleration she slowed downed while moving upward.

The graph attached can be well understood to analyze the scenario.

c. electrical charges of ionic bonds.