Objects 1 and 2 attract each other with a electrostatic force of 18.0 units. If the distance separating Objects 1 and 2 is changed to one-third the original value, then the new electrostatic force will be units.

New force will become 162 units

Explanation:

Let the charge on each object is q and distance between then is r

Electrostatic force between to object is given by

From the relation we can see that electrostatic force is inversely proportional to square of distance between them

Therefore

Now  new distance

So

im sorry i dont know

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.