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 four times the original value (i. e., quadrupled),
then the new electrostatic force will be units.

Because its reliable.   there is no pollution  the chances of a radiation leak is low

I'll do it rn and then answer

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.