A line with a positive slope on a distance-time graph shows that the object

a) is speeding up
b)is at rest
c)is moving toward the origin
d)is moving away from the origin

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?