A ball rolls off a 1.0 m high table and lands on the floor, 3.0 m away from the
table.

Thats nice,whats the question. Are you just telling us the ball rolled 3 meters off the table? If so good for the ball :)

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.

reserve is the answer