If a compasses moved close to a magnet, the compass will always point

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?