Freddie drives his car 10 km North. He stops for gas and then drives 5 km South. What is Freddie's displacement.

5 km

Explanation:

displacement is the straight line distance from a particular point. since north and south are in opposite directions, it means that he has taken a u-turn

thus, 10 - 5 = 5km displacement

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.